1 Select wise fitting: When choosing a bra, make sure that you shut the clasp on the loosest fitting or maximum to the middle fastening position. Avoid buying a bra where the best fit is the tightest fit. This allows you to tighten the bra as it stretches over time with wear and washing. This is the best way to make sure that the fit is right for you.
2 Bands should be well cut: Make sure that the front and the back of you bra band are parallel. The back of your bra should not be riding up your back. It should be a perfect circumference that settles at the right place.
3 Cups fit proper: The bra cup should be big enough to prevent the breast tissue from spilling out over the neckline or from the armhole edges. Also, if the cup wrinkles it means that the bra is loose for you.
4 Right size: If the waist band of the panty keeps bunching up and rolling over in the front, the size is wrong. The band of your panty should always stay in place .
5 Neither too tight nor too loose: The fit around your bottom should be balanced, covered and cupped. The panty crotch should fit naturally against your body. There should be no excessive fabric in the front or back.
(With inputs from Suman Nathwani, nightwear designer)