The size discrepancy between the sizes is huge. Medium fits in the shoulders and chest, but the shirt is too long and too much room in the waist. The small sizes seem right around my waist, but the chest and shoulders are way too tight to wear comfortably. The collars/neck bands in these shirts are also too thick. It’s like a mock turtleneck. The one good thing I can say is that the material feels soft and amazing. But the fit sucks.