After looking through the sizing chart, if you are close to the upper end of one size, I'd recommend buying the next size up.  The material is fairly thin so I'd also look into some thinsulate long underware, especially if going outside in this thing.  The torso, arms, legs and 'boots' are all one piece.  You get into it like an evening gown, through the back where there are 4 velcro tabs for closure.  The 'boots' are open on the bottom with elastic bands on each for placing over your socks, then inside shoes (think baseball uniform leggings).  The muscle chest is a thin shapped piece of foam and gives a fairly good effect.  The belt is a formed piece of plastic that is tied around the back. The cowl is a combination fabric/foam piece that secures under the chin with a velcro tab; same with the cape.  I recommend taking everything out of the packaging and hanging up to get all the creases out and mess with the ears to get them to stick out away from the cowel.  I may use some stripped twist-ties threaded through the middle of the ears to get them where they should be.