When I was thinking about the sports I wanted to design for in the early stages of writing the book, I knew I wanted to somehow cover swimming, and I initially wanted to include a traditional swimsuit. But when it got down to the drafting instructions, it would’ve been tricky to construct using just the included blocks, or it’d mean I’d need to include a whole separate panty block just for the swimsuit so instead I took inspiration from my friend, Emily, who is an avid Cornish surfer as well as being a runner, climber, cyclist, and all-around advocate for natural movement (and indeed, the athlete model for this design in the book!).