The band should feel firm and supportive, as well as being horizontal across the body, being the same level as the front of the bra. The hook and eye should be fastened on the outermost hook, ensuring you can fit two fingers underneath it.
If the underband ‘rides up’ it is too big. If the underband ‘digs in’ it is too small.
The breast should be fully encased within the cups. The cup should offer good support and forward projection, creating a smooth silhouette. If the cups are wrinkling and loose offering no support, it is too big and if the breast is spilling over at the neckline and underarm, it is too small.
Straps should lie flat on the shoulders, not slip down or leave marks. Straps help balance the weight of the breast, rather than provide support and uplift; this is generated from the underband.
Centre front sits flat against the body. The breast should be completely encased in the underwire, which should be following the natural crease of the breast.