This photo probably gives us our best, most detailed look at a Houdini straitjacket. To my eye, this appears to be the same straitjacket that surfaced on Pawn Stars in 2011. It later sold at auction for $46,980. There is a very distinctive V-like dip in the leather across Harry's upper chest that occurs on both jackets (you can also spot this in some film footage). So it looks this pic is also a gift to whoever now owns this jacket!
Thanks to Kevin for letting me share his share here on WILD ABOUT HARRY. Below are a few other gems from the Connolly Collection.
UPDATE: Check out the newspaper clipping in THIS POST about Houdini's 1915 straitjacket escape in Los Angeles. The photo is a pretty good match.