Depending on what version of the game the gear varries bit, like that "holster" or "yoke" bit you see at the back isnt in some games and sometimes he is wearing a tac vest as opposed to the "chect rig" style
http://splintercell.wikia.com/wiki/Category:Equipment
for the look you have in the pic you posted try the yoke from a 82 pattern canadian web gear, with a cote of black krylon obviously
as you can see it has the same sort of shape and position and you can see the straps come off so you could thecnically rig it to most any belt comberband ect.
to prety much any black tac vest will do for a Sam Fisher look
Sry bout that last one couldnt help myself lol.
but for that look in the pic for sure the 82 pattern would be the closest looking and prolly rhe cheapest