Definitely bigger than what the size chart says. I followed the guide closely and I should be a medium but it ended up too big on me! Now perhaps its also bec it does stretch (failed to figure that into my size decision) and that I do like my jacket a little snug and form fitting. So, partly my bad. Good thing this should fit my mom so I won't be sending it back. Meanwhile I ordered another Columbia fleece jacket (not Benton style) and the XS fit me to where theres no bulk - just the way I like it. So I suggest size down if you want the jacket to fit you just right or to be a little snug. Otherwise for loose comfort and movement, and if this will be your top layer jacket... stick to the size based off of the size chart.