From Thinkgeek:

Each Star Trek The Original Series Uniform Hoodie is as perfect as we could make it – teaming up with the folks at CBS, of course. There are three styles (each with a specific Rank Braid). Here’s the rank breakdown: Command Gold is Captain, Sciences Blue is Commander, and Engineering Red is Lieutenant. No Lieutenants were harmed during the making of these Star Trek The Original Series Uniform Hoodies… promise.

[Star Trek TOS Uniform Hoodies | Via FG]