I have a chest thats rather on the large side and I find that a lot of whats in the shops at the mo is just to low cut for me even with a minimising bra. I think if you are uncomfortable then you may be better wearing something else but I bet you think your cleveage is more on show then it really is.
I was at a wedding recently and wore a fairly low cut dress but as it was well cut at the side if you get what I mean I didnt feel I was flashing the boobs too much!

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Jenny xx