A little (OK - a lot) late, but something I've been drilling over and over. Initially, I came to the same conclusion as Moxieman. However, after re-reviewing the IG, I have concluded that the red patch vest -while optional- is part of the official cub scout uniform. In addition to the fact that it is sold by the official organization as "the perfect complement to any official scouting uniform," The insignia guide clearly does not prohibit it.
The IG - as quoted by Moxieman - states "[p]reviously earned badges and insignia not representing present status make a fine display on a BSA red patch vest, a trophy hide or blanket, exhibited in the home of the recipient, or at functions where such a display is invited." This should not be misinterpreted to read that the vest, etc. may only be "exhibited in the home . . . ." The "exhibited in the home" clause is one item in a list, not a general condition for all items in the same list. In fact, the only place the IG specifically bans excess patch wear is on the uniform shirt itself. Thus, the BSA patch vest is not precluded from being worn with the uniform by the IG.
Moreover, it seems more than a coincidence that BSA would go to great effort to classify the vest as a "BSA" item, and that they would specifically sell it as a "compliment" to the uniform. It almost seems as if BSA is trying to hint that it is authorized official uniform wear. It would be nice if they would come out and say as much explicitly.
In any case, while the uniform regulations are incredibly important, I think that other posters here have a great point. Scouting is for the scouts. Patches are designed to be recognition in the form of displaying scout accomplishments. As the uniform should appear neat, the BSA has restricted the scout to wear one temporary pocket flap patch, and one temporary pocket patch at a time. The BSA has made an accommodation to scouts who are especially ambitious to create an optional accessory vest. Although it is not required, it is counter-intuitive to restrict it completely.
