Any tips on how to discreetly feed a toddler while wearing a Marilyn Monroe-style dress where I have to get my breasts out over the top of the dress to feed him?
Do I just need to drape a pashmina over the top and hope DS doesn't try to claw it off?
I usually use the top up, vest down method and last time I fed DS by getting out my breast over the top of something, DH told me I was indecently exposing myself. 
I'm going to a wedding on DH's side of the family, where the bride & her siblings were bottle fed because the idea of bf made their mum shudder, so I don't want to be too in-your-face (and I don't want DH to be embarassed!) although I don't mind people being able to see that I'm feeding. I doubt most of the family know anyone else who bf even a baby, and my PiL have stopped discussing DS's bf'ing, which suggests it's moved into the Taboo Topics of Conversation.
DS is nearly 21 m.o. and any feeds will be preceded by him screaming 'Milk! Noooow!'. While he feeds he will keep coming off the breast to chat to me and/or complain that I'm not reading to him like I do when feeding at home.
He doesn't like noisy places, large groups of people or strangers trying to talk to him / touch him, so I anticipate him wanting lots of feeds.