I use these jammers for swim training.
Not so great-- very snug at the thigh hemline. It stretches out eventually, but initially they are tight. The waist is a bit loose, though. Can tighten with the waistband, but almost feels like they ride low.
The great stuff--Inside of the water, everything is golden. Feels good, not obstructive a bit to the training. Very comfortable. I am satisfied, definitely.
-True to size, but if you want you can order a size down for very snug. I wear 32, and 32 works just fine for me.