I will talk about Scotland marriage tradition.
In Scotland, When people marry get married, male wear Scotland tradition cloth. The name is Kilt. Kilt is a skirt for man. When males wear Kilt, males don't wear underwear. It's my stlye =) (just kidding..) and with traditional dance ceilidh. When I saw about this wedding, suddenly I want to get married like this. So funny and interesting. They look so happy and enjoying.
You can try!! without underwear ~.~ If you want. you can see this site ^^ here This is korean site, so you can not understand, but just reference only picture. so good!!