Silly Football/Soccer Question
 

When a sports caster says that a player has 15 "caps under his belt." What does that mean? Thanks

Got this from google:

"The number of official international games a player has played in for his or her national team. Reputedly, at the turn of the century these players actually received a "cap" for each game. They don't now but the term is still used. (e.g., "She has 20 caps" or "She has been capped 20 times")."

Yeah, also to count as a cap the player actually has to be on the pitch. So if they are an unused substitute, they don't get a cap for sitting on the bench.