There's already talk of a non canon sith group in the works. Unfortunately, most 'Darth's & 'Lord's come up with costumes as 'interesting' as a tie pilot helmet and an anorak, so most other fans would prefer to be in a costuming group where there is some form of standards, hence all the canon groups demand a belt.
And Cipher is right, a combat vest would be impractical for all the jumps/flips a jedi would have to do.
Also, comfort-wise at conventions would be an issue. I went to the last con in just my jedi tunics, and I was cooking throughout. I certainly wouldn't have wanted to wear my tacvest there as well!!!
And have you ever tried running with full leg pockets on a pair of cargo pants? It's totally impractical, and should you have to draw a saber quickly from your pocket halfway down your leg, you'd more than likely trip yourself up as you're walking, or the other guy would decapitate you long before you could draw yours.
Equipment is easier to get off of a belt quickly, and is more practical for movement, that's why all military forces/ emergency services still use equipment belts.
Plus, the belt just completes the outfit!!
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