you wear.. one of these :
the wedding itself is called 폐백 (pyebaek)
You have the two parents of the male side of the family stting across a table
<- like so,
and you bow 4 times, showing respect for the male's family and their ancestor.
Then then the groom's parents toss chestnuts and other nuts, symbolizing their wish for the new daughter in law to have many healthy children.
Well, that's the "traditional wedding". It takes place after the western styled wedding these days. In the western styled one, it's just like weddings here, you get to wear the big white dress, with father bringing you to the alter and such.
Hope this helped a bit XD;
Good luck to your marriage : D!