I'm a 5'3" curvy woman and found the adult small to be a pretty good fit.  If you're much taller, you might want to go for a medium. It's pretty roomy in the waist and shoulders and snug in the hips and thighs.  It didn't shrink or fade when washed.  The material is soft and comfortable, and the construction seems pretty sturdy.  The "trap door" in the back is pretty easy to use; it has three large buttons.  The bear print on the back is adorable!