On Good Authority
On Good Authority is a London-based boutique consultancy advising luxury, lifestyle, and performance apparel brands on strategy, design management, materials, product development, supplier relations, sustainability, and team building, led by founder Sara Lewis Brittain.
- Company typePrivate
- Founded2018
- HeadquartersLondon, United Kingdom
- Headcount—
- GTM typeB2B
- OfferingServices
What On Good Authority does
On Good Authority is a London-based boutique consultancy operating in the luxury, lifestyle, and performance apparel sector. Founded in 2018 with a consultancy relaunch in 2026, the firm is led by Sara Lewis Brittain and offers seven service lines: Strategy & Planning, Design Management, Material Consulting, Product Development, Supplier Relations, Sustainability & Transparency, and Team Building. The firm's client base consists of apparel brands seeking expert guidance on range architecture, technical outerwear, sustainable sourcing, and the construction of high-performing design and product teams.
The business model is a classic single-principal professional services engagement. Revenue is generated through project-based or retainer arrangements delivered directly by the founder, with prospective clients initiating contact via the website form or direct email. Pricing is not publicly disclosed. The company leverages Sara Lewis's two decades of experience at Timberland, Musto, and Shackleton (where she was Product Director from 2020 to 2026 and drove a 10x revenue increase), alongside her co-founded contemporary rainwear brand OGA, as portfolio credentials. There are no disclosed full-time employees beyond the founder, no external funding, and no proprietary technology platform. Distribution is entirely direct, with marketing relying on the company website and the founder's LinkedIn presence.
On Good Authority firmographics
Firmographics- Name
- On Good Authority
- Legal name
- On Good Authority
- Website
- https://ongoodauthority.co
- Company type
- Private
- Founded year
- 2018
- Operating status
- Operating
- Short description
- On Good Authority is a London-based boutique consultancy advising luxury, lifestyle, and performance apparel brands on strategy, design management, materials, product development, supplier relations, sustainability, and team building, led by founder Sara Lewis Brittain.
- Ownership category
- akta.pro rank
On Good Authority industry classification
Industry- Product category
- Apparel Consultancy Services
- NAICS
- Management Consulting Services (54161)
- SIC
- Services-Management Consulting Services (8742)
- akta.pro primary industry
- Supply Chain Sustainability & Responsible Sourcing (SMETA, supplier ESG) (EUAHAJAE)
- akta.pro secondary industry
- Luxury Licensing & Brand Management (CRAKAFAL)
Keywords
Where On Good Authority is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Markets served
On Good Authority business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Marketing or Sales, Operations, Technology or R&D
Revenue model
- Apparel Consultancy Services: Professional consultancy services for luxury, lifestyle, and performance apparel brands, including strategy and planning, design management, material consulting, product development, supplier relations, sustainability guidance, and team building. Revenue is generated through project-based engagements or retainer arrangements with brand clients seeking expert advisory services.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels2 records
On Good Authority product offering
Product offeringCore offering
On Good Authority is a boutique consultancy led by founder Sara Lewis that provides expert advisory services to apparel brands across strategy and planning, design management, material consulting, product development, supplier relations, sustainability and transparency, and team building. The firm focuses on luxury, lifestyle, and performance apparel with specialist expertise in technical outerwear and sustainable garment manufacturing.
Product overview
On Good Authority is a consultancy led by Sara Lewis offering specialized services in luxury, lifestyle and performance apparel industries. The firm provides seven distinct service offerings: Strategy & Planning, Design Management, Material Consulting, Product Development, Supplier Relations, Sustainability & Transparency, and Team Building. Additionally, Sara Lewis co-founded OGA, a contemporary rainwear brand for women. The consultancy has delivered projects for major brands including Shackleton (high-performance outerwear), Timberland (premium outdoor apparel), and Musto (technical sailing and outdoor apparel).
Differentiator
Problem solved
Functional benefit
Brands
- OGA: An outdoor, lifestyle brand merging contemporary design, responsible manufacturing and cutting edge technology to create stylish, technical rainwear for women.
Products and services
- Luxury Performance Apparel Consultancy Services Specialist advisory services covering strategy and planning, design management, material consulting, product development, supplier relations, sustainability and transparency, and team building for brands in the luxury, lifestyle, and performance apparel industries. Delivered directly by founder Sara Lewis through project-based engagements or retainer arrangements.
- OGA Outdoor, lifestyle sub-brand offering contemporary rainwear for women that combines stylish design with technical performance and responsible manufacturing.
Companies that use On Good Authority
Customer profileNamed customers4 records
Segments1 record
Ideal customer profiles1 record
On Good Authority technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
On Good Authority partnerships and signals
Strategic signalScale indicators3 records
Recent moves4 records
Expansion highlights3 records
On Good Authority competitors and assessment
Company assessmentBroad incumbents
- Boston Consulting Group: BCG advises luxury and fashion brands through its Consumer and Fashion & Luxury practices. It competes with On Good Authority at the strategy-advisory layer but operates as a broad incumbent across multiple industries rather than specialising in apparel product.
- Bain & Company: Bain's global Luxury Goods practice advises apparel and luxury brands on strategy, M&A, and operations. It overlaps with On Good Authority's Strategy & Planning service but at much broader scale and across wider luxury categories.
- McKinsey & Company: McKinsey operates a global Fashion & Luxury practice that advises apparel brands on strategy, operations, and growth. It is comparable to On Good Authority at the strategic-advisory level but operates at much larger scale and broader scope, serving as a broad incumbent in the same category.
Direct peers
- Stylus: Stylus is a UK-based consumer trends and innovation research agency serving fashion, beauty, and lifestyle brands. It is comparable to On Good Authority as a specialist advisory input on product and consumer direction for apparel and lifestyle clients.
- WGSN: WGSN is a UK-based trend forecasting and consumer intelligence subscription business serving apparel and lifestyle brands. It is directly comparable to On Good Authority as a specialist advisory input for fashion/apparel product teams on trend, materials, and product direction.
- Edited: Edited provides retail and merchandising analytics for apparel brands. It overlaps with On Good Authority's product strategy and range-building services, helping brands make data-driven assortment and pricing decisions.
- Alvanon: Alvanon is a global apparel product standards and fit consultancy. It is comparable to On Good Authority as a specialist advisor to apparel brands on product development, fit, sizing, and quality assurance — directly overlapping the Product Development service line.
- Li & Fung: Li & Fung is a Hong Kong-based apparel sourcing and supply-chain specialist. It overlaps with On Good Authority's Supplier Relations and Material Consulting services, particularly in connecting brands with offshore manufacturing partners and sustainable fabric mills.
Market position
Strengths4 records
Weaknesses5 records
Competitive moat3 records
Key risks6 records
Key highlights7 records
Customer concentration
On Good Authority social profiles
Digital presenceOn Good Authority financial estimates
Financial estimateRevenue estimate
Valuation estimate
On Good Authority leadership team
Management profileNumber of profiles
Profiles1 record
On Good Authority funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
On Good Authority M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about On Good Authority
What does On Good Authority do?
On Good Authority is a boutique consultancy led by founder Sara Lewis that provides expert advisory services to apparel brands across strategy and planning, design management, material consulting, product development, supplier relations, sustainability and transparency, and team building. The firm focuses on luxury, lifestyle, and performance apparel with specialist expertise in technical outerwear and sustainable garment manufacturing.
Is On Good Authority a public or private company?
On Good Authority is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was On Good Authority founded?
On Good Authority was founded in 2018.
Where is On Good Authority based?
On Good Authority is headquartered in London, United Kingdom, in the Europe region.
How does On Good Authority make money?
One revenue line is on record: apparel Consultancy Services.
Who are On Good Authority's main competitors?
Broad incumbents on record are Boston Consulting Group, Bain & Company and McKinsey & Company. Direct peers are Stylus, WGSN, Edited, Alvanon and Li & Fung.
Does On Good Authority have an API?
No public API is recorded for On Good Authority.
What industry is On Good Authority in?
On Good Authority's product category is Apparel Consultancy Services. Its primary akta.pro industry code is EUAHAJAE, Supply Chain Sustainability & Responsible Sourcing (SMETA, supplier ESG), with a secondary code of CRAKAFAL, Luxury Licensing & Brand Management. Its NAICS code is 54161 and its SIC code is 8742.