I also remember that for the RWC 2003 (?) Clive Woodward investigate the possibility of putting some of the backs in leggins/all in ones to make them harder to tackle - no jersey/shorts to grab - as part of his "make 100 things 1% better" policy.
Response from the IRB to an informal question was that players were requried to wear shorts, shirt and socks.
So perhaps the worry of the IRB is that the leggings etc are there to gain an tactical advantage, and they haven't thought about the lower levels/other cultures or other reasons that people might wear them.
Banning them was easier than putting legislation in place to stop people gaining an advantage I suppose.
Response from the IRB to an informal question was that players were requried to wear shorts, shirt and socks.
So perhaps the worry of the IRB is that the leggings etc are there to gain an tactical advantage, and they haven't thought about the lower levels/other cultures or other reasons that people might wear them.
Banning them was easier than putting legislation in place to stop people gaining an advantage I suppose.