why has this not happened

Probably because they were pants first and shorts are just a short version of the original. Otherwise we would have come up with a better word.

Shorts could be called like pantlets or something (that might be a thing idk man)

In Japan shorts are called half pants.... the more you know!

IVE BEEN LOOKING FOR THIS

They're called trousers you swine.

I lost it at sit sits

My 4 yr old brother called them longs after he heard us call shorts 'shorts'.

I lost it at sit sits

Read this post on the toilet. At "sit sits" I shit shits.

XD

God damn it Moon Moon!