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I sat for 45 minutes last summer in the hot sun (100°F/38°C). I was pinned in on the bleachers so I wasn't able to get up and move. I could feel the sun burning through my pants. Now I have everyday burning and stinging on my right front upper thigh.
Is it possible that I got sunburned through my clothes?
Yes it is possible to sunburn through clothing. Clothing does block some of the Ultraviloet radiation but not 100%. A lot of outdoor recreation clothing is now marketed with treatments that gives additional UV protection.