Everyday full cup bra with a wide back (and wider straps too) for comfort.

[sugarbum]

I wear a 38D usually.
I'm a size 18 -20 and in spite of my best efforts I have considerable back fat.
I want something with a back like in the photo ( I own this bra - I got it from China on ebay and its bloody brilliant for a night out to hold everything up, but it is definitely not a daytime bra)

I'm not an unusual size but I just want something that is a reasonable price with a wide back (not a front fastener) and hopefully slightly wider straps too.

Can anyone make suggestions? I need either full cup or balcony style.

I tried Doreen bras and for day-to-day wear, they are great!
Admittedly not sexy, but I can live with that!

First things first, have tou tried measuring using this guide? thebetterbracampaign.blogspot.com/p/fitting-advice.html?sm_au=iVVNT6s4s1kn0bvq