Should the X in a collaboration be capitalized?
There's some collaboration like: Supreme X Lacoste (brand x brand) or Chris Brown x Tyga (singer x singer)

In this situation, should the X be capitalized?

and how do you pronounce it?

Question

Should the X in a collaboration be capitalized?
There's some collaboration like: Supreme X Lacoste (brand x brand) or Chris Brown x Tyga (singer x singer)

In this situation, should the X be capitalized?

and how do you pronounce it?

Answer

I agree with N. It's certainly not something common in that context, so there possibly isn't a precedent for capitalisation. 
My guess is that they are using the idea of cross-breeding, so I would say that you pronounce the x as 'cross'. And if you are using the capitalisation from plant names, then it should not be capitalised.

Answer

It looks like this was originated in Japan. From the examples I've seen, you do not have to capitalize the 'x'. You can see examples at the bottom of this page: http://arkitip.com/product/x-mark-of-collaboration-issue-no-0053x/

Answer

Who uses "x" like this?
"+"?
"and"?
"with"?