In desperate need of a GOOD bra!

Basically what my title says. I am a teacher so I need full coverage and I cannot find a bra that I like, fits well, and actually hides my nipples consistently during the day. my measurements are 41.5, 40, 39.5, 47.5, 49.5, and 47 in the calculator which gives me a 42FF or 40G. I'm in my 30s and have had 3 kids who nursed like crazy so my breast tissue is much fuller at the bottom and I feel like most of the bras I've tried gape so much at the top that it looks weird. I typically only wear bralettes at this point because everything is either uncomfortable or doesn't fit. Please help me!!