If you've been following the matches of the Champions Cup in Berlin, you probably know that it's been often disputed in the comments how players should be wearing shirts with their names and numbers.
This would offer some advantages :
-easier identification of players for referees and viewers
- protection from cuts and scratches of fins and nails
- possibility to place sponsor logos.
I my opinion, wearing a shirt should only be recommended but not obligatory.
This is what the CMAS UWR rules have to say about this :
2.4.3 Suit colours
Each team must be in possession of a dark blue or black set and a white set of swim-suits and caps in corresponding colours. The swim-suits may have small areas with flag colours, team/country names, etc., but the suit colour must be clearly dominant. Shoulder straps and top front part of the female swimsuit must follow suit colour. The swimsuit must be clearly light/dark in the water. Transparent suits with darker suits underneath, or suits underneath of contrasting colour that are visible through or outside of the top suit should be considered incongruous.
So they do not limit wearing shirts. What's wrong with the rules then? In my opinion, defining any dominant color is unnecessary as long as both teams are wearing easily distinguishable uniforms. Just try to imagine soccer, basketball or rugby teams, if they were limited to wearing either blue or white colors. Makes no sense, right?