I played around with a few hair styles but wasn't really sold on any of them. A few came out looking ok.
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The big problem with hair, especially long hair, is getting it to behave in all situations.
Bending over, laying down, tilted to the side.
A hair has to have a lot of morphs to look like they are obeying gravity and the longer the hair, the more you have to always be tweaking and adjusting it.
There's a great looking hair assets for G8 Females that looks amzing, but you can't use it on any girl with more than an A cup tits because the long hair clips through her breasts and the morphs are so shit you can't easily fix it. So dispite looking great, it's unusable.
There's dforce hair which removes the need for morphs by letting you simulate the hair so it falls naturally but that's a whole other conversation and also adds time to each and every render you've got her in.
For Sidney, and Lauren, and Mandy. Their hair being in a pony tail makes adjustments to the tail super easy.
I've learned when creating a character for a game, it's not just how the hair or cloths look. It's also how easy they are to work with in a variety of positions. Jacky's short hair has some limits when she's laying on her back, but other than that, it's very easy to deal with. It also fits with who Jacky is. For a mother of three with a full time job, something short, classy, and easy to manage makes sense for her.