Here are some of the most common tell-tale signs that you need a new bra.

My breasts are bulging out of the top or sides of the cup and my bust looks lumpy under clothes.

This is a sign that the cup size you are wearing is too small, as your breast should be completely covered in the cups. Try at least one cup size bigger.

My bra rides up my back or shifts around as I move.

Apart from trying to squeeze ourselves into cup sizes that are too small, the most common mistake that we make is to wear band sizes that are too big. The strap around your body should fit snugly and when you find it to be moving around, this indicates that the band around you back is too big. If this is happening, you need to try a smaller band size. But remember, a smaller band size will also be smaller in the cup (i.e. a 34E is smaller in the band and cup than a 36E). For example, if you find a 36E fits you well in the cup but is too big in the band, try a 34F.

The wires stick out at the front or dig in under my arms.

When the wires stick out or dig in like this, it's often because the cup size is too small and your breasts are forcing the bra away from your body. Try a cup size bigger, so that the wires lie flat against your body and your breasts are fully covered.

The straps dig into my shoulders and give me red marks.

The main support provided by a bra should come from the band around your back and not the shoulder straps. If your shoulder straps are digging in, you are probably wearing a band size that is too big. You want the weight of your breasts to be evenly distributed between your shoulders and your back. Try at least one band size smaller. Again, you might need to find a larger cup size to compensate the change in the band size.

The cups are wrinkly, particularly at the top and sides.

This is usually a sign that the cup size is too big, so you may want to try at least one cup size smaller. Also make sure all your breast tissue is inside the cup of the bra by bending forward and putting you hand in the cup, pulling all your breast tissue forward.