The last line of the Tur talks about קמטים that women attached to their leggings and sleeves, which is forbidden to do on YT because of tikkun kli. I have no idea what קמטים are. Anyone know?
That said, my understanding of the history of fashion is that collared shirts, with the collar attached to the shirt, is a somewhat modern invention from the first half of the 20th century CE and that prior to that collars and cuffs were attached to the shirt. See here

http://www.uaf.edu/theatre/students/resume...es/sears97.jpeg

Would it be forbidden to attach a collar or cuff to a shirt, lets say with buttons or other fasteners, on YT because of being metakein a kli?

Permanently?

9

I don't know. I assume even temporarily since I didn't see anything to indicate otherwise, like if you attach it with intent to remove it within 24 hours it's ok.

Usually it means wrinkles, here I believe it means something like pleats.