I think the by-law is probably a good approach- better if actually enforced, because as folks have pointed out, we actually are a uniformed organization although we disagree sometimes on how far that should be enforced. I also have a hard time with leaders who have untucked shirts, too tight shirts (overweight Scouter issues aside, if you expand, you should get a bigger shirt), and boys who come partially uniformed because their parents can't find certain items. When all is said and done, we have to strike a balance between being flexible in our 'militarism' in order to encourage the growth of young boys, but still avoid compromising the key aspects of scouting. It's not ans easy issue, but that's why we can discuss it in forums like this.
For those interested, I'd recommend reading Baden-Powell's 1908 'Scouting for Boys'. I just finished it and it is pretty eye-opening to see how far we have strayed from his vision in some aspects (check the part on 'uniform')
Semper Scouts,
CM Pack 683