Now bras using magnet or normal hooks?
Women no longer have to worry about dowdy bra hooks creating
unsightly lines and bulges beneath their tops. Lingerie marker
Gunze has designed a stylish medal-shaped magnet hook for bras. The
two magnets are firmly attached and fasten very easily. Pulling the
bra from the side or sliding it up and down won't open it.
Magnet Hook Bra, Sabrina of Gunze Ltd
Price varies depending on size and design.
http://www.gunze.co.jp/sabrina/index.html