I had a really cool Pepsi watch in about 1989. It had a wide, blue plastic band. On the top of the band was a metal loop. Hanging from the loop was a tiny, plastic three dimensional Pepsi can, and there was a teeny digital clock on the end of the can. I loved that thing.
As far as clothes went though? No one would have ever worn a Pepsi shirt. It was all about those Coke rugby shirts.