The characters have two levels of difference: Skeletons and model. Maya and Shey for example have a different skeleton so obviously they also have a different model. Maya and Lala on the other hand have the same skeleton but still a different model, Lala is a bit thicker than Maya. Jenny and Maya also share the same skeleton but Jenny has bigger boobs and is a bit more thicc too. Because the models are different in thickness it doesnt matter too much if they share a skeleton or not, repositioning the clothing to that other model is still going to take some time and it isnt a 1-button and done thing. But from what I saw in the post they do intend to repurpose it for other characters suggested by the patrons anyway tho so it probably wont be released only for Jenny.It's a new modern outfit which they are making for Jenny. Hopefully other female characters can wear it too though. Except for Shey and Jadeen they all share the same skeleton I really don't understand why they are locking outfits to certain characters. Have to say that if they make a version of this with the jacket but without the tank top it would be hot.
They also posted this on the discord.