I strongly suspect that people who decide it runs small are (a) a little bigger than they think and (b) it's warm / hot wash and dry. I bought two sizes based on their reviews and as I'm 5'10M with a 31" inseam and 31/2" waist, S/M fits great and L/XL might fit me and one other person True to size, wash in cold water and hang dry as the garment is meant to be worn.
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