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Sierra White leads SIINGE STUDIO with a philosophy rooted in the belief that strong products begin with a clear understanding of the people they are designed for. Her work sits at the intersection of creative direction, technical development, and strategic product thinking, allowing brands to move beyond guesswork and build with clarity.

Before founding SIINGE STUDIO, Sierra developed a multidisciplinary background spanning apparel design, product development, and spatial design, experiences that shaped her ability to translate vision into tangible, functional outcomes. She has contributed to projects connected to brands such as Free People, Victoria’s Secret, Calvin Klein, Maidenform, Yummie, Luisa et la Luna, Original Ugly, and Jenny Yoo Collection, gaining deep exposure to professional development workflows and fit-critical production standards.

Today, Sierra works closely with founders and leadership teams to refine product direction through audience insight, trend analysis, and performance-driven decision making. Rather than separating creative vision from technical execution, SIINGE STUDIO integrates both into a cohesive development process that supports brands from early concepting through production readiness.

Her approach is grounded in ethical manufacturing and responsible design methods, with a focus on creating products that feel intentional, well-made, and aligned with long-term brand growth. By combining strategic thinking with hands-on development expertise, Sierra helps brands build assortments that connect with their audience while maintaining strong technical and commercial foundations.

Featured Partners are carefully selected individuals with proven experience, exceptional service standards, and are considered to be true experts in their field. Each partner has been personally reviewed by the Entreupia team and approved based on expertise, delivery quality, and long-term potential.

Sierra White is the founder of SIINGE STUDIO, a U.S.-based apparel design and development studio known for its work in technically complex, fit-critical categories including lingerie, swim, adaptivewear, and eveningwear. The studio partners with founders and leadership teams who treat quality and fit as non-negotiable, helping them create products that resonate deeply with their audience while building systems that support long-term growth.

Denver, Colorado, USA | Present

Lead end-to-end apparel design and development from early concept through production readiness
Partner with founders and leadership teams to align creative vision with strong product systems
Conduct audience research, trend analysis, and competitive positioning to guide product direction
Oversee technical design, tech packs, fit strategy, and development workflows
Analyze product performance, return data, and customer feedback to refine assortments and improve fit outcomes
Guide ethical sourcing strategies and responsible material selection
Known for work in fit-critical categories including lingerie, swimwear, adaptive apparel, and eveningwear

Founder — SIINGE STUDIO

Denver, Colorado, USA | Present

Lead end-to-end apparel design and development from early concept through production readiness
Partner with founders and leadership teams to align creative vision with strong product systems
Conduct audience research, trend analysis, and competitive positioning to guide product direction
Oversee technical design, tech packs, fit strategy, and development workflows
Analyze product performance, return data, and customer feedback to refine assortments and improve fit outcomes
Guide ethical sourcing strategies and responsible material selection
Known for work in fit-critical categories including lingerie, swimwear, adaptive apparel, and eveningwear

Apparel Designer — Free People

Intimate Apparel Categories

Designed and contributed to 24 collections across intimate apparel categories
Conducted in-depth trend research across runway, streetwear, and emerging consumer behavior
Developed apparel concepts aligned with brand aesthetic and seasonal direction
Created tech packs, supported fit sessions, and collaborated with production teams to refine execution
Oversaw material selection, trims, and print direction to ensure cohesive product storytelling

Contract Design & Development —

Victoria’s Secret, Calvin Klein, Maidenform, Yummie, Luisa et la Luna, Original Ugly, Jenny Yoo Collection

Delivered design and technical development support across lingerie, intimate apparel, eveningwear, and ready-to-wear categories
Contributed to product refinement, fit strategy, and development execution across both emerging and established brands
Supported brands in translating creative concepts into manufacturable, well-fitting products aligned with brand identity and audience expectations
Collaborated with internal teams and external partners to ensure alignment between creative direction, technical requirements, and production feasibility

Product Developer — Fun.com

Managed development of 200+ products across apparel, accessories, and lifestyle categories
Oversaw technical specifications, vendor communication, and production timelines
Coordinated cross-functional teams to bring concepts from ideation to market launch
Ensured alignment between creative direction and functional performance

Interior Designer — Modsy

Developed personalized design concepts and 3D visual presentations
Strengthened client collaboration, creative direction, and storytelling skills
Built strong foundation in translating vision into practical execution

Victoria’s Secret
Calvin Klein
Maidenform
Yummie
Luisa et la Luna
Original Ugly
Jenny Yoo Collection
Fun.com

Portfolio & Case Studies

Selected Client Work

Selected work that demonstrates the capabilities of our partners.

Testimonials

A few words from clients who chose to work with Sierra.

"Working with Sierra has been an incredible experience! She brought our vision to life with precision, creativity, and attention to detail. From concept to a finished prototype and tech pack, she made the entire process seamless and professional. Sierra truly listens, communicates clearly, and delivers high-quality work that reflects her expertise in design and garment construction. We couldn’t be happier with the result and highly recommend her to anyone developing a new product!"

"SIINGE transformed and streamlined our manufacturing process. Most importantly, they educated on us sustainability and factory ethics then infused that knowledge into our brand product. SIINGE is an impactful partner for our high-quality streetwear clothing."

"SIINGE STUDIO is amazing! They are extremely talented and knowledgeable. They are meticulous and thorough. If that isn’t enough, Sierra is also extremely kind, pleasant, and professional. I highly recommend SIINGE for any fashion related services."

"These designs are perfect and I love them. Sierra is a rockstar, thank you!"

"It was so great to work with SIINGE STUDIO. Sierra understood my style and vision perfectly and executed the design so well! They added sessions to make sure the piece not only fit flawlessly, but was flattering as well. This was absolutely worth every penny!"