I don't think making a selection option (that already exists) available for all costumes can be called "feature". The hairstyles are there, you just cannot use them on certain costumes although you can do so on the console version. I actually think it's just a bug or something they forgot to take care of.
Exactly about what character are you talking about? Because actually I saw pictures of the PC Version where fans used DLC outfits with the alternative hairstyles.
If something I know that the new hairstyles are not implemented on all the old outfits (for example Tina has her Hairstyle B implemented on her C! but not on her red riding hood costume)
Kasumi. On PS4 for example, I can use her new hairstyle on her pop idol costume as well as on her police or maid outfit. But I cannot do so on PC, the new hair option does not appear there but is still available on non dlc outfits like her ninja suits.
If the things are so, this has to be definitely a bug of some sort because I saw other DLC outfits allow the choice of the new hairstyles, as for example the NINJA 2015. I believe that it's a problem only of the DLC from 5U.
Thanks for the notice, I will try to say it to Team NINJA through Twitter or FB.
If you can check at least anohter character it would be better, so we can be sure if the problem is localized only on Kasumi or to everyone. But I'm pretty sure that all the female characters have the unability on PC to use the new hairstyle on the 5U DLC outfits while they can do it well on PS4.
Oh, that would be great if you could send it. I don't have a facebook or twitter account and I think the social media way might be the best way to contact them. Not saying they don't read e-mails, but yeah ...
Mhm ... I can't really test this on my own without buying another dlc, since I only own Kasumi dlc's and none from other characters who got a new hairstyle. I would buy a single one for tests, but since they only sell them in dumb packs now, I won't.
However, I still did some research via YT and Google. The pack that I bought on steam contains a lot of costumes, also for those with new hairstyles like Tina and Mila. So yeah, if you watch this video here for example,