Some trends are blatantly obvious to the observer (read: head-turning corsets), while others are much more subtle. Lately we’re noticing a seemingly small detail—the ring zipper—quietly infiltrating the fashion sphere, bringing an unexpected but welcome sporty vibe to dresses, jackets and knitwear. Some may just see it as another closure, but its playful allusion to grade-school P.E. pullovers and retro track suits make it a fall must-have in our playbook. Whether you’re into an après-ski vibe or a more fashion-forward iteration for work or evening, shop our favorite versions of the look ahead.