This is a dusky pink light cotton shirt that has a bow tie and elastic in the puff sleeves. As such I am not an expert in all things antique but I do try to describe things to the best of my knowledge.
Although this is a 12 it is a very small 12, more like a 10. This is fine cotton, very pale blue with small spots. Mandarin collar buttons up. Buttons on half placket and cuffs. Nice long sleeve, again quite slim.