I probably have a size 30-31 on my waist, I bought the medium one which is advertised as a 32-34 and they fit perfectly. The fabric doesn't look like it will "stretch". So if you're in between, consider placing an order. The shorts themselves are mostly cotton with some spandex added to give them softness and stretch. Would consider it primarily "casual wear" but they look good enough to wear outside the home. The fabric is incredibly light and feels thin so keep that in mind as it probably won't hold up with wear and tear. But when shopping for groceries/eating/relaxing/sleeping, it's probably one of the most comfortable outfits to wear. The pajama bottoms I had are moderately stylish, so "why not?"
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