[Senusret I]

NPHC organizations (and many other BGLOs, LGLOs, and MCGLOs) have rules/protocol on how paraphernalia may be worn, including what color the letters may be. Each set of rules may have variations.

I personally will not comment on whether another organization's colors are equal in value to their letters. I CANNOT speak for ANY other organization on the NPHC, and I hope that none try to generalize on my behalf. We are all different organizations.

I have not seen sitched letter shirts in any colors other than the official colors of that organization. However, I will enumerate some things I have seen among NPHC organizations:

Letters on one of the two official colors.
Letters on white, black, gray, khaki, and denim.
Letters bordered in a color not normally associated with the organization, but not exactly clashing with the colors. I think this is called an "anchor" color.
Letters made from a fabric that is in the colors of the organization. (For example, black and gold plaid.)
Chapter letters (on the sleeve) in a color other than one of the two official colors.
Paraphernalia in the "official substitute" colors.

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Finally.....I am a grown man and will wear whatever colors I look good in....and that's ALL OF EM! lol But when it comes to Alpha paraphernalia, tradition dictates that my letters are in black and gold, and the fabric must be black and gold or some other neutral color.