Bathing suit material...a cheap bathing suit. It had the distinctive sheen and feel that had the effect of making it look cheap and tacky. This type of fabric also doesn't breath at all, so I started sweating right away.
The fit is very boxy; it billowed at my waist and stretched taught at my hips (I'm 38-30-42 and ordered a M).
The fabric turns white when it stretches, so your anywhere it's tight will show the telltale signs of stretching...bend over in the mirror and watch it change color. Embarrassing!