Conor McGregor vs. Floyd Mayweather. Who wore it better?

Conor McGregor and Floyd Mayweather may never square off in a ring, but at least we can see them do battle ... in matching bathrobes!

Conor posted a pic of himself Wednesday in a red Versace robe -- the same one 'Money' sported poolside in Miami last year. The gear costs about $550 retail. In other words -- about $1.25 to these guys.

So, the important question ...