Okay so as far as I can see, there are two pieces (the bust holder and the neck/waist part) that were knit flat and then each one was twisted by flipping one end through the holes multiple times, and then the neck/waist piece was laid on top of the bust holder and sewn to the side pieces (which are ribbing). I think it would be pretty simple knitting, although the pattern has some shaping on the bust cups.
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