ATC84 saidAussie runs a little on the tight side. I have a 28-30 waist depending on brand and XS feels is a very tight squeeze. I go with S.
Well, their size chart says that 28 and 29 inch waists are XS and 30 goes up to a S.
The ones I ordered arrived today. My waist at the point the size chart says to measure is right between a M and L but when I tried them on, the waist fit fine. The leg openings were on the tight side though and I felt my butt was stretching the fabric way tight!
I'm dieting down after bulking up the last three months and still have a week and a half before I go on vacation and plan to wear them. Hopefully by that time they'll fit just right.
But back to the original reason for the thread. If you're planning on getting Aussiebum swimwear, just measure where they say to measure and follow the sizing chart on their website. The sizes on their chart seem pretty spot on.