The Vest looks like a military black BDU shirt with it's sleeves cut off. The movie vests were most likely custom sewn. The long pockets along the bottom of ILM vests are very uncommon for traditional BDU shirts.
A common misconception about the RFT Vest is that it was simply a longer version of Han Solo's vest. While the two vests are similar in look, they are designed very differently. An image in the Reference Section clearly shows the back of Han Solo's vest, and you can compare the differences.
We cut the sleeves all but 1/2 inch from the shoulder seam. We then tucked that extra under and stitched it to the main body of the shirt. We duplicated this process for the collar also.
Upon getting some inquiring email from a Simon Graham, I took some time to research the RFT vest pockets via screencaptures taken from the Star Wars DVD that came out in 2004.
From what I have gathered the pockets on the standard RFT trooper are as follows:
Below are some images that we marked up in our research. Email us if you want to discuss/dispute our findings. We only researched one or two hours, so we might have missed some details.
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