Based on size chart I ordered a medium 5'5" 133 lbs. 37 28 38 but it is very tight. Thought about returning it but need it right now so have to keep it. Wanted to help others with order in the future to size up.Loved this jacket so much i had to purchase it again as my first one is starting to get worn after many uses.. if i layer up underneath with a base tank, thermal, long-sleeve shirt and this jacket, it's warmer than my thick snowboarding jacket with base tank and thermal (no long-sleeve) and way less bulky than wearing that boarding jacket. i forgot to look at what size i purchased prior but figured small should suffice either way. Usually there isn't a noticeable difference between XS and S when it comes to jackets, but there is definitely a difference with this jacket.I liked the style but it was a little snug so sent it back. I am 5 feet 130 pounds and ordered a small. I could wear it but in cold weather, it would have been uncomfortable to put a sweatshirt underneath it. Great quality. I own another outdoor research jacket for fishing and love it. It is a medium and plenty of room to spare for warmer clothing underneath it. nice looking just for a spring jacket also.Great jacket - I bought it for my wife and she loves it. Fits true to size.The armpit vents up the side are unusual - the zip all the way from from the bottom sides up to the pit. A little different to get used to, but still gets the job done.The jacket is VERY waterproof and reasonably breathable.A good buy for the money!Loved the color and the fabric. The fit wasn’t what I was looking for and so I did send it back. If a different size comes up for the same money, I could buy again.Everything is perfect except for two features - not so crazy about "VELCRO" (easily worn out in time) & it's way too SHORT!Great protection from the weather! A little warm/stuffy, but excellent value for the money!I am very fat in my stomach so it is too tight in my hips and stomach area. I ordered xl and it is to small.