depop can have cool shit if u can look
etsy seems to be pretty common as well
what u r looking for seems to be lolita inspired.
https://42lolita.com/collections/lolita-dresses?srsltid=AfmBOootXEIj_xQVl3axVyztbQd2_9zFEDaw6nLbwbIdk_BBed-7drib
https://www.devilinspired.com/en/?srsltid=AfmBOor4tDjGC9haJrMcoELBIEJVoUFAXsc2xHdR6e8sngFPEJ-MDn9o
ht......