There are thousands of brassieres on offer, but if you're looking for the one you can wear day in and day out, then we've got answers.

There are three things you

1. Your breast shape: More often than not, it's the shape of a bra, rather than the size you've chosen, that could be a problem. "Size and shape don't correlate, so you can be a G cup but have shallow breasts because all your volume is at the bottom, or you can be a D cup and all the volume is up top, so you're full," explains Claire. Look at the way a cup projects out from the side of the bra—if it's deep-looking, then you need fuller boobs at the top, if it's shallow-looking, then it's right for girls with weight at the bottom of their breast.

2. Take your time: "Try at least three different bras, don't give up after the first one, and if it's your first outing, you should also try three different brands. It's a process; just like when you're buying jeans," Claire says.

3. Replace your bras often: If you're battering your bras and wearing them constantly, you will need to replace them every six months or so. Be sure to get fitted again as well—our bodies change more than we think.