This is all from my limited perspective of course. Some or all of these markets could already be served brilliantly and I'm simply not aware. It was harder than I thought to think of markets with pain points that aren't properly served. Only the first idea is mine, the rest were generated by AI, but I thought they were interesting.

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1. Summerwear for People Who Want to Avoid Sunburns but Don’t Want to Wear Sunscreen
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Sunscreen is messy, greasy, and there have been recalls of certain brands due to certain chemicals like benzene that actually cause the cancer people wear sunscreen to avoid. A clothing brand that can popularize long-sleeve shirts, hats, and other items that can minimize sun exposure and keep the wearer cool and dry would profit immensely.