Mermaid's Delight

Stay with me, but do the shape of these shells remind you of the cup bras favoured by ladies of the deep in film? Also, how do those shell bras stay on? 

For those living on land these elegant earrings will come with sterling backings and would elevate any look. Though, all this talk of mermaids has me hoping the buyer pairs them with a bathing suit or resort look. 

Vintage. Sterling silver. From Mexico.