Re: Rx vega 64
No, those are britches. The breech is what you stick in your britches and where the crap comes from (in biological sense, the breech is your butt; in artillery sense, the breech is the back of the gun barrel--think breech-loading). As for a breach, it's normally considered militarily or architecturally: both in a bad way, as it usually means a break in some kind of line or fortification (think hull breach).