A US Tartan

[O'Callaghan]

OK, I will be the stick in the mud here. So much of what gets discussed here is in the realm of "there are no rules", however this is one of the few times when there are more than rules, there are laws.

I found the sections that would appear to cover a flag Kilt. (d) is the most important. (g) would seem to cover Kilt pins or the patches and embroidery used by some manufacturers. (h) would additionally address sporrans and even if the above didn't cover it, (j) would seem to rule out highland games.

Oddly enough, if one were to be too short for all 13 stripes, that would negate the whole thing, as while likely tasteless, it would no longer be illegal as it would not really be the flag anymore.

UNITED STATES CODE
TITLE 36
CHAPTER 10

§176. Respect for flag

(d) The flag should never be used as wearing apparel, bedding, or drapery.

(g) The flag should never have placed upon it, nor on any part of it, nor attached to it any mark, insignia, letter, word, figure, design, picture, or drawing of any nature.

(h) The flag should never be used as a receptacle for receiving, holding, carrying, or delivering anything.

(j) No part of the flag should ever be used as a costume or athletic uniform...

None of these tartams are the flag, or even part of the flag. Moreover, many national flags are red, white and blue, e.g. Britain, the Netherlands, Russia, etc. In fact, I understand that the first US flag was made from material originally intended for making British flags, and that is why you have the colours that you have.