Ayumi Orihime:
I've noticed some cis gendered females, once they get to a really big size, seem to get thicker facial hairs.
Mochiibabii comes to my mind.
It's probably linked to an hormonal imbalance of some sort.
Have you noticed this on yourself?
This sounds like PCOS; rather than being a consequence of weight, it’s a hormonal condition that makes it easy to gain weight and hard to lose it. There are different variations of the disorder but one is an insulin resistance subtype. Also if someone has PCOS but has an eating disorder that artificially suppresses their weight, but then they gain weight (either through feederism or regular recovery) it can “unmask” other symptoms like hirtuism
