Patterned shirts are more likely to at least make the area look flatter. They help draw attention away from fat rolls, so I don't see why they wouldn't draw it away from breasts as well. Also, you could wear baggy clothes that could minimize the look, but they could make you look a little heavy set.
How can you have breasts when you did not have the surgery? You still have a dick so the only thing you would be hiding is your dick, why not just go online and look it up and then delete your Internet history quickly after