Officially-licensed Star Trek TOS robes from Thinkgeek:
In the era of the original Enterprise, space did seem a whole lot bigger. They were a little slower to invoke the Prime Directive; a little quicker to pull out their phasers. There were Romulans behind every nebula, constant threats of war with the Klingons, and no holodecks or replicators to take the edge off of living in space.
That means the Star Trek TOS Robe needs to be sturdy, 100% cotton, and able to withstand the daily trials of going where no one has gone before. Choose your color: Gold (Command), Blue (Science and Medical), or Red (next to die).
In the era of the original Enterprise, space did seem a whole lot bigger. They were a little slower to invoke the Prime Directive; a little quicker to pull out their phasers. There were Romulans behind every nebula, constant threats of war with the Klingons, and no holodecks or replicators to take the edge off of living in space.