gun - anything she is comfortable using doesnt have to be an MP5
vest - i've seen a few girls run tactical vests and plate carriers, as for breast protection a decent BDU jacket will do the trick.
field - thats a tough one as I don't know toronto, we have a few guys up here who bring their wives/girlfriends out.
standing out - everybody ends up looking the same in tac gear
"You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."