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UK based ladies, sports bra question!

Hello all

OK so this is a bit odd but I just wondered if anyone had any thoughts, here goes....

Here we are in lockdown and prior to that the fitting rooms were closed anyway. My problem is I really, really need new sports bras! I have put on weight and my current ones are too small. Despite following online measuring guides I have now ordered 4 bras from 3 retailers (all different sizes, all supposedly right) and .. none fitted.

So I am cramming myself in and it is uncomfortable!

Have any of you ladies out there had any luck with sports bras sized by dress size and not band and cup? I know they won't be as supportive but I am doing LI at the moment. Are the Nike ones any good for example? I am definitely not bigger than a D cup.

Thanks so much!!