The heavier fabrics in the full 8 yards hold their shape and swing much better than the lighter ones and they probably last a lot longer too. That is why the hire companies all use 16 oz cloth. If you think you might look a right pillock then why are you even considering wearing a kilt? You don't need a lot of accessories other than a sporan anyway, a top, socks and boots look good but as sjrapid says it is an impressive outfit for formal events and that is when you want a good kilt.