What’s up with Jinx’s choker/necklace?

I’m trying to figure out how her choker works for a costume but the jail scene has me a bit confused.

I always assumed it was a ragged part of her top, but she has it removed alongside her other belts/accessories. Then we see her wearing it again as a detached necklace in her finale outfit.

Do we think it’s always been detached but was modeled as one piece for simplicity (like how her boots are missing eyelets on the folded parts, which are later shown in her finale outfit)? Or was it simply torn off her top?