In conventions, people are making name tags that look like their in game ones so they can be identified since the username is such an iconic piece and to identify a player with, I think the merch should include their name tag, I know I would if I want Vrchat merch is to have my name tag on it.

In game stickers are really nice, do consider making some for the real world.

A unique idea is working with iconic Vrchat world makers that have been an important landmark for the game for years, of course they would need permissions from the players who made them, but I think this is idea would be very cool to wear your favorite map on a shirt or jacket IRL