Interesting timing on this for me. I had a pile of shoes purged from my closet and set aside, almost all mule style booties, sandals, loafers and kitten heeled pumps all bought in the 2000s.
Last week I pulled a few pairs back into my closet and I was even going to post an new Ask Angie thread about whether or not the style was dated, but saw some mules still showing up on Nordstrom and other retailers.
I seem to have a habit of getting rid of things just as they cycle back.