Big boobs here, and double layers can get really hot, especially for sling wearing! I questioned my own ideas about modesty and whose sensibilities I was considering. They weren't my own so I decided that I didn't care how much boob 'showed', as long as DS was getting it - especially as I couldn't exactly have a conversation with him about how my boobs are big and some people don't like it...hearing the conversation play out like that in my head convinced me that it wasn't my problem and what people say about me behind my back is none of my business It's much easier to pull down, and I pull up a top if it's really cold!
Plus, I didn't want to be going in for the idea that public breastfeeding is all right if you have small boobs and you don't show much, and not ok if you have big boobs - a non-sensical message to support. So I don't. Covering myself up sent ME the wrong message about an action that is ultimately nurturing and natural and most inoffensive.
Don't get me wrong, I didn't just get preggers, decide to breastfeed and go out in public with no issues...I'm a product of our society! I thought I wouldn't want to feed in public until the first time I was in public and DS wanted to feed. It took som adjusting before I asked myself and answered the questions.
And, finally, my big, cumbersome, in the way, pendulous boobs FINALLY had a purpose, other than to be dolled up as nicely as possible to keep them aesthetically digestible and looking as small as possible (with minimiser bras!)...!!
Probably doesn't help you much right now, and is food for thought.