Board Thread:Spoilers!/@comment-413929-20150114222625/@comment-1894786-20150328035101

Technically, if the EF events take place in real-time (in time concurrent with the LWM) then Cruella was probably born in the 40's, like Regina was. So if her backstory occurs when she's about 10, then Cruella's story in both worlds would evolve concurrently, explaining her presence in the EF, also why she would draw inspiration from a "future" time period, because that time period would have been in the past.

Also, we've only seen her in black dresses and fur coats in the past. Yes, they look very 1920's, but black dresses and fur coats have both existed for millenia.