I wear undershirts/shorts almost every day! In summer there is nothing better than a nice white waistcoat, especially one that fits well, it looks very good. I am a tall man 210-215lbs but bought size A thinking they might be very long like all the others I have. They were so small that the fabric stretched so much that it was translucent. Then I got an X-Large size and they are just a little oversized. I had to check that I hadn't chosen women. Also, the spot where you put your hands is so small that it rubs your armpits. I don't usually write reviews but because there is no help to solve this problem.
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