Let me first give kudos to Amazon for making the return process effortless.  About the jeans, they are so, so cute I just loved them (if they had fit!).
Before buying these jeans, I took my measurements, read the reviews & comments, & asked questions here to get feedback from others.

Based on these factors: 5' 7" 140 lbs.; comfortably wear a size 6, I tried size 26 x 32.  Way way too small - I exchanged them for 27x32.  Too small in the waist, but otherwise were okay; again, another exchange: 28x32.  They fit great in the bottom & hips area but tighter in the waist than I like.  Unfortunately, I can't get a 29x32 in the dark vintage wash, so I asked for a return authorization on them, but am still debating on whether to return them.