Ordered one size up,
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This review is from: Quiksilver Men's All Time Long Sleeve Rashguard T-Shirt (Apparel)
As other reviews stated I went up one size and it's right for what I wanted, not too loose, not too tight. I did notice some "ripping" in the bottom seam when pulling it on the first time, but it doesn't seem to have affected the garment. It's lose enough that you can wear it around the pool, but snug enough that it isn't flushing all the time and you can even wear it under a wetsuit.