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Just look at a photo and cut the fabric correctly, then put a zipper in front

Depends on which one. If you want a TOS pattern, they have one in Franz Josef's Starfleet Technical Manual. Other costume patterns can be found at fabric stores or online. Star Trek fan clubs are a good source, they usually have people who are into costuming.

Links to find your local Starfleet Command/Starfleet Int'l chapter: has several styles:

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