2 things for the lizard boye:

1: it's not like any of the 20% of her body that is covered by clothing is armoured. And your jacket won't change that. She already has feathers covering her entire body keeping sharp objects away form her skin and dampening impacts like a thin gambeson. Your jacket will not add any meaningful armour.

2: Her only defense currently is, when some mammal brain see mammary gland, mammal brain stop thinking. It's what she replied on before, why her previous victims were that dumb. If you cover the booba you'll remove that bit of protection.

My point is, give her a plate carrier or don't try to dictate her clothes.