Despite the "no zipper" myth, they have appeared on screen in Rogue One , The Empire Strikes Back , and The Book of Boba Fett .
On boots and gaiters, exposed zippers are often only acceptable if they are located on the inside or back of the leg and color-matched to the material.
Zippers on flight suits or vests must generally be hidden by flaps, velcro, or armor plates to maintain a "seamless" look.