As a size 40F - yes folks F - I commiserate, but can't offer any help with brands.

However I have resorted to making my own in the past - before I found a brand which fitted fairly well.

It is not that difficult if you have a stock of old bras to raid for the strap adjusters - it is not a good idea to make the straps without adjustment, and the height of the sides is important too, it should be high enough to hold things in place, but too high at the front of the band and it cuts in.

I think that it would be easier to get a fit with a back fastening bra - they seem to be the most common, but as that is not acceptable, either get one which would be easy to alter, or resort to making your own.

Anne