That one you posted the link to on ebay wouldn't be any fun, Hal. Half of the fun of the straitjacket is proving that
you know how to get out of it. It's just not possible without being able to pull the arms over the head, unfortunately.
(Not in any way that I know of, at least.)
Get rid of the little chest strap and the crotch straps, and I'm all over it.