www.femalefirst.co.uk/catalog/sizing-chart.php
This link should help you work out your OWN correct bra size...personally I don't rate my Local Bravissimo at all...they have a tendency to size you according to what they have in stock..... I've tried it on recommendation of a friend, & was not impressed at all, & I do have a lot of years of proffesional experience in how things should fit, so know when they are wrong......my friend was sold a Bra, which she was flattered into buying by it been a smaller strap size & bigger cup size than she really needed, causing under arm bulging...which she thought was normal for all Bras
but that said I DO agree a good fitting bra is essential, & many people wear the wrong size
& as for Trinny & Suzzanna...don't get me started...lol........
Yes high & polo necks ARE fine with an ample bust, but not tucked in & do break the neckline with chunky jewellry to draw the eye away from your boobs...... & wrap tops ARE great, especially with a pretty vest filling in the cleavage if its not apropriate to flash a bit........
basically anything that draws your eye to your neck/decolage, as opposed to boobs with work, so V necks, or high with chunky accessories, scarf etc.......keep it fitted or tight UNDER your bust so as not to give the illusion of big all the way down...or nip in, & then out again if you are bigger below too...... & keeping lines long, such as tops worn out of waist bands, tunics etc also will help give a more balanced illusion.... & pattern is really down to personall taste, though of course avoid anything that gives a bit of a "bullseye" effect over your boobs
hope that helps