An integrated, end-to-end, fashion partner for established brands AND start ups.

Comprehensive apparel & accessories solutions.

Solutions crafted for success.

We join your team as partners—hands-on, precise, and guided by a respect for the process and a practiced ability to listen. When you need full-service support, we manage each phase—from design through development and production—with the same care we bring to every stitch. And when the need is more focused, our experience allows us to step in seamlessly—supporting a single phase of your process with the same care we bring to the whole; whether that’s design refinement, material sourcing, or production oversight. Our work spans the full spectrum—from collaborative design support to end-to-end development and production—each step shaped by experience and attention to detail. The result: apparel built with purpose, refined through use, and made to last.

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About Us

Threadlines Theory is a solution decades in the making. An agency that understands the intricate details of apparel design, development and production (Threadlines) combined with the experience and ability to apply best practices and innovative strategies (Theory). Our unique process has resulted in long term success for start-ups with an idea they believe in, emerging brands ready to scale their business & increase their margin, and established global brands with specific needs.
Hear Our Story

Precision in every detail

“I had the pleasure of first working with Mollie and Sherri when I was the Chief Product Officer at Tracksmith, before rejoining Saucony in 2021. At a critical time for the company, and as the brand created it's reputation for quality, fit and performance it was Mollie managing the entire product creation process/sourcing behind the scenes and Sherri ensuring that all products fit and were well constructed. Their combined experience, expertise and understanding of the holistic process made them fundamental to our success. When I heard that they started their own consultancy I immediately brought them on to help Saucony improve our apparel product creation efforts. And I am so happy to say that their impact was immediate - they are already taking us to new heights.”

Brian Moore, CPO Saucony

Creating Magic Details

"Sherri came at a critical time, heading up our product development and sourcing. She helped us reground our product - starting with a comprehensive fit analysis, re-grading, and building of our master specs that have now become enduring and beloved fits by our customers spanning many years. She also geeks out about product & construction - the hidden elements and what have become to be known as the "Magic Details" of our products - to even our most complex, award-winning intelligent, heated jacket." 

Gihan Amarasiriwardena
Co-Founder & President, Ministry of Supply

Investing in long standing relationships

“Mollie brings a deep knowledge in apparel product development, sourcing, and the global supply chain management to the table. I know her as someone with not only a deep expertise, but also a high level of caring. She understands every step of the process and approaches even the smallest details with thoughtfulness and precision. What truly sets her apart, though, is the value she places on people - she invests in long-standing relationships and shows up as a reliable, collaborative partner time and time again. Working with her means having someone you can trust not only to deliver, but to strengthen every relationship along the way."

Jose Fernandez
President, Global Merino

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    Wear-tested,
    time-tested,
    future-proofed

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