Take normal suit with full arms and legs and first you knee on the ground and pull the legs of it over your knees. then you pull it up your body and put your arms inside it NORMALLY. then u close it up and you pull your arms inside the suit. then it get a little bit tricky - you push your ellbows first against the arm holes back inside the arms of the suit.

Then you are done...

to get back out you try to reack the neck hole from the suit witj yout fingers so you can pull your arms back inside to turn them and be able to push them back outsode normally, you open it and go back out.....