First things first- get yourself fitted for a couple of really great bras. They will take inches off you and stop that 'shelf' look under certain clothes.
Avoid anything that hangs off the breasts- it'll make you look like oyu are in full sail.
Look for a small V neck- down to the beginning of the cleavage and wear a lovely necklace with it. Draws the eye up.
Avoid a lot of cleavage showing.
A good blazer or Summer jacket in a lightweight cotton or Summer weight wool worn over a form fitting top or shirt with a good bra will take off inches and distract the eye. Same again with a shrug worn over a vest- you can get lightweight summery cotton cardi shrugs. Wear one of these over a couple of vests, a vest with a control bust 'shelf' underneath another vest. The longer one underneath.
Buy shirts from companies that cut for larger breasts. Bravissimo does work ones.
Re tops - Go for stripes (pin striped and breton stripes) and boat necks are also lovely as are off the shoulder worn with a vest underneath so you don't expose too much cleavage. It is a myth that horizontal stripes are widening. They are actually the opposite- they define and streamline the shape but choose the width of the stripe carefully- you may want to try wide/narrow and see what looks best.
Re prints- nothing too large, nothing too busy. Make sure the print doesn't 'stretch' over the breast and distort. Small modern florals are good as are abstract shapes- when a shape repeats in a predictable way the eye is more trained on anything 'getting in the way' of the way the pattern looks. If it is a shape that we don't recognise- abstract shapes or distortions of a floral, say, then the breasts become less noticeable.
Wear tops that skim your hips and follow your shape. Nothing blowsy or billowy. Empire line can work but it can also get a bit 'Jane Austen' tits on a plate IYKWIM? I'd wear Empire only if the bottom half is very streamlined and maybe a blazer/ cardigan on top.