This is the solution, buy an IAABO patch and sew it on your shirt or a black jacket.
Honigs Canada sells them for 9.99 CDN$
http://www.honigs-canada.com
They are not on the website but in the catalogue, so send the guy an e-mail, and ask him about them.
Then you can buy your shirts and jackets from whomever you please. And sew on your own patch.