Pairs

Single items called pair and theoretical reason

Pants/shorts - two legs
Glasses - Two lenses
Scissors - two opposing blades
Tongs - two um er grippy things....Not sure entirely
Stockings - again 2 legs
Headphones - two speakers
Pliers - 2 ply--thingies......
Bolt cutters - two hardened steel blades to cut, well bolts.

OK I get it they are _using_ or _made for_ pairs... So what happened with naming the Bra?