Let me start by saying that it sucks that you were treated so poorly when asking to try on a Jason Wu dress. (((hugs)))

Now, to answer your question. I used to dress far more formally. I loved the fabrics, the textures, the luxury of it. Since moving to the middle of nowhere, I have had to adopt a far more casual style. There is too much dirt and uneven ground and slobbery dogs and and and...
On the rare occasions when I don't have to worry about getting dirty or breaking my ankle by trying to walk across rural ground in heels, I still love to dress more formally. I wish I had more of those days.