Of course spillage and large bands aren’t the only problem when it comes to bra fit. What about back fat, stretch marks, or painful shoulder strap indentations? Here’s what you need to know:

• Back Fat: Back fat usually comes from being overweight, or from aging skin, which is softer as we get older. Edmark suggests finding a bra that has a lot of back coverage to minimize the bumpy look under clothes. And if that doesn’t work, “Wear a shape wear camisole. It gives a flatter appearance,” says Edmark.

• Stretch Marks: Unfortunately, stretch marks are a reminder of a bra mistake you’ve made in the past. “Stretch marks are from not having a lot of support. Many girls didn’t wear the right bras as they were growing, and that lack of support creates stretch marks,” says Koch. (For lingering stretch marks, try a stretch mark cream, like Ambi Soft Even Stretch Mark Diminishing Body Oil, $7.99.)

• Shoulder Strap Marks: If your straps are digging in, that means you’re not getting the proper support from the back and the cup, and all your breast weight is pulling on your shoulders. According to Edmark, your straps should only support 10 percent of your breast weight, and she suggests this simple test: “Put on your bra. Stand up and pop off your straps. If it turns into a strapless bra and stays up, you’re good,” says Edmark. And if you still have shoulder mark issues, Koch’s store sells little bra shoulder pads that slip underneath the straps.