If I may delve into this..
Scouts should have a Dress Uniform (very similar to the current one, but in a poly/cotton blend, as it looks nicer - remember, a Scout it CLEAN. Also I would include a t-shirt to be worn under the dress shirt).
But I also believe that a Scout should have a uniform suited for the outdoors (wicking, fast drying, etc). This would include pants very similar to the current break-away pants that are becoming popular, as well as a Troop t-shirt of the wicking type, and maybe an over jacket of the BDU-type (with bellows pockets). This jacket would also have the Council and troop numbers.
Granted, I am of a military mindset, and I know that the Scouts is NOT a military organization, but I think that the above listed uniform would suit the needs of the Scouts well when they are enjoying the outings they often enjoy.