To prevent the strap concern on any bra style look for a bra that has non-slip straps. Playtex offers a wide cushioned strap bra to prevent that dig-in feel and will not fall off the shoulder. Try Playtex style 4013 as it offers the wide cushioned straps and has seamless cups that look great under clothes.
Shannon from Graham, WA USA
HerRoom Response: When one of your breasts is larger than the other, you should fit to your larger breast. To balance you out, we suggest you add a breast enhancer such as the "Bump-a-cup" bra inserts into the cup of your smaller breast.
Jenny from USA
HerRoom Response: This bra by Playtex is specifically designed for the full figure woman. The two sizes you mention do not qualify as being in this category.