Had this happen in a Savage Worlds campaign set in the old west. My gunslinger Mark Reid was only 5’ 6”, slight of build, and appearance half hidden by their slightly oversized debt hat and tinted glasses.

They were actually Maryrose Caroline O’Shannon, from a semi-wealthy Irish family. She’d ran away to US to avoid an arranged marriage.

I’d dropped a few vague hints, but we were playing online, so they were easy to miss. I thing the GM was planning on her old life catching up with her at some point but the group broke up before anything was ever revealed.

(Mary/Mark Read was a real life female pirate who posed a man until she ran into Anne Bonnie & Calico Jack Rackam. The character was kind of a combination of Mary & Anne, visually leaning towards the pretty boy appearance of Leo from Quick & the Dead.)