I realize this response is 4 years late... but in the army that's pretty good.
Within DWAN, their email is +2 Svc Bn Clothing Stores@2 Svc Bn@Petawawa
Outside DWAN it's
[email protected]
Their number is (613) 687-5511 x6280
Mon, Wed, Thurs 0900-1500
Closed Fri
Tues by Appt