"Film company" shirts, sweaters, hats ect?

Had an interesting thought about something. I was just wondering how you acquire brand name film company shirts, sweaters, jackets, hats ect? Say like Kodak, Fuji, Panavision ect.?
Does the production contact the company, tell them that you are shooting with this stock or this product, then they'll send you "promo" stuff to wear since it will be advertisement for them?:hmm: Just wondering how this works out.

I got a project(semi-big) coming up in Dec and we'll be using a few "name brand" items, so that's why I have the question. :)
 
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