I am a XS. Waist 24. The XS in this pant is way off. Very unforgiving. I needed a small and BCBG will not do a straight exchange. I was told I had to buy another pair then get my money (the change in price) when the pants get returned. They wouldn't hold me the size. BCBG had no customer service during their online sale on a Saturday. I had no one to consult on size. Their size charts are inaccurate. My tailor gave me my exact measurements so I have the correct measurement numbers. So size up.