how did you figure out the "woman" you were speaking to online

Ugh , I only got catfished once on EP. I made this “ girl “ friend , at first chatting was casual and friendly. But then she started sending me pictures of her in Halloween costumes , and saying how her sister liked her dressed up in multiple Halloween costumes. Then I started to get suspicious cause her conversation topics would be pretty much all the same. About Her dressed up in little red riding hood costumes etc. Until I think I saw a public post of someone outing them and exposing them as a catfish. I’m pretty sure I was talking to a man with a crossdressing/costume fetish the whole time.