"bigger than expected" - Review of Marmot DriClime Side Zip Pant - Men's

the pants look great and they'd been 5 (best) if it would've been not too big, in this case a medium, my fault because when i went to paragon i tried the driclime in size medium (that fitted me "just a little" thight), they didn't tell me it was for women, so i realize i needed a large, is there any chance i can replace it for medium for men? i got rid of the receipt and tags (just asking), because it's a beautiful pair of pants.
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