A couple of days ago I drew a rendition of fs's uniform (version 3). This isn't concrete as I'm sure people have their various mental images of it. This is just what I had pictured in my own mind.
The locking harness is a bit different, mostly because it wasn't really going to show up very well from the front view and would need side/rear views to appear full. My solution was to add a few more straps and make the locks visible in the front. If things look a little bit huge and outrageous, I actually used models for these and matched the proportions and actually shrunk them a bit vs. how the actual items appeared. I also chose the color scheme based more upon contrast and they are a little different than the original way that I imagined it. Doesn't he look happy?
I did a modification just to show the gag and blindfold that attach to the head harness through some mythical locking mechanism that I never fully explain. In my mind I had pictured something along the lines of the locks that you would find on a portfolio style briefcase that could be attached very easily but would require a key to remove.