Yep an F cup here
def the two layers- lovable make an awesome singlet top that is soo comfy and good for big boobs- works a treat
also i have a babba sling and can feed in that really discreetly- no one can actaully see that i am feeding when bubs is in it ! it is ace and DS loves it!

I just whip mine out when they are needed and are gettting so much better at not exposing myself
It takes practice