The mesh-backed cap flashes the name and open-mouthed fish logo of the 49-year-old outdoor retailer, which is best known for selling reels and duck decoys. To Mr. Alvarado, it’s just a good ...

Maor Zabar, 36, from Shenkar in Israel, began making the hats after being diagnosed with Crohn's disease and being banned from eating his favourite foods. Designs reference all the foods he misses.