Bras slide down due to several common fit and construction issues. The most frequent culprit is an underband that's too loose or has stretched out over time, which causes the front to drop while the back rides up since the band provides the majority of support in a well-fitted bra.
Cup problems also contribute to slippage. Cups that are too small or shallow for your shape push the bra away from your ribcage, while oversized cups create excess space that allows downward migration. M
any women compound these issues by overtightening their straps to compensate for poor band and cup fit, which actually pulls the back band upward and makes the front slide down even more.
The solution lies in finding a firm, level band that sits securely around your torso combined with cups that properly contain and support without gaps or spillover, allowing you to move confidently without constant readjustment.