U.K. clothing brand Seasalt and vintage retailer Beyond Retro have joined forces to produce a limited-edition capsule collection, with each one-of-a-kind piece crafted using repurposed denim.

The emerging denim brand leapt into ready-to-wear, expanding from upcycled jeans into tailoring, shirts and eveningwear. Displayed in a two-story space on Regent Street piled high with mountains of ...