The plus size thing is very important. When most cycling manufacturers consider a size 12 an extra large it knocks a large majority of us out of buying their products.
Also, if you do built in shelf bras, please help out us well endowed girls. Sports bras at a reasonable price in a 40C are very hard to find. I know there are people larger than that out there that would like to find something that fit and was attractive. The stuff out there now looks like something that hung on my grandmother's clothes line.