I am large breasted also and I don't think there's any such thing as a comfortable bra or sports bra. Because when your girls are big any bra will pull down on your shoulders and make them ache. Now I know this might sound crazy but I have on more than one occasion during workouts or just doing housework that I have rapped my gilrs with an ace bandage. That way I get the support without the tension pulling on my neck and shoulders. It works perfect! But I'm pretty sure it would look funny doing that in a cute dress on a night out with my hubby! There's a time and place! Lol
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I have a 44g bust and when i'm in pain bra straps just cause added pressure and irritate the skin further. To be honest I have found the best thing for me is no bra but have a pillowcase size piece of cotton material and place it under the breasts to avoid any chafing.
Why girls want giant boobs is beyond me they are a pain in the shoulders, back and ass. Lol you gotta laugh or you would cry.

Hi. During flare ups I can't wear a bra most times. I went to target and bought camisoles (Merona brand, very inexpensive ) they also help as layering. Good luck.

I wear tank tops under my shirts... Im sure the ones that aren't so tight are obvious that im braless that day... But im sorry. Anyone that has Fibro lives with several challenges per day... I'm sure its not gonna hurt someone if they notice were going braless.. --tank tops, or I believe they call them wife beaters.... Gd luck to you.... God bless and gentle hugs. 💝