That ask about a Boiling Isles wedding dress makes me want to think of witch wedding traditions and stuff.
Like, instead of tossing a bouquet, they do something throw a frog or something to decide who next gets married. (Frog was the first thing that popped into my mind).
Like, come on! Their version of prom involves the royalty fighting a monster that manifests fears so obviously their wedding traditions are gonna be weird to us humans!
Back in the olden witches getting married would give a piece of themselves to each other. Usually a tooth, finger, a bone, and sometimes even an eye (for a "eye got my eye on you" pun)
The Protector reminds me of Cartier's Love Bracelet:
It's a famous (and super expensive) bracelet characterized by its screws. It can be put on and removed only by using a screwdriver, and it represents eternal love.
"The bracelet was designed in the shape of an oval in order to fit as closely as possible to a loved one's wrist, and it was designed to not be taken off on a daily basis. It's physically screwed on to signify the permanence of true love, since two people are needed to secure the screws. Ever since then, the Love bracelet has become a symbol of love and commitment due to this design."