We have 2 shoe/dress/accessory clips, one is purple the other pink.  They are vintage items. They are round (plastic) with a single gold tone metal clip on the top.  It measures about 2" across the center (outside measurement) or 1 1/4" on the inside opening.  The clip is on top and goes around the top. They are in nice condition showing very minimal wear.

2 Shoe Dress Accessory clips Vintage