I got this from a website about Vietnamese wedding ceremony traditions:

Vietnamese Ceremony Traditions

PRESENTS
It's customary in most Asian cultures for the groom and his family to pay for most of the wedding costs. They also must present the bride's family with lavish gifts.

Traditional Vietnamese grooms wear long tunics and travel to the bride's home and give gifts to her family during the official engagement period. With the bride and groom's families in attendance, an older male states the groom-to-be's intentions. If it is an acceptable match, the families celebrate together. This is a really fun tradition and one that shouldn't be forgotten.

Most grooms are responsible for the music at the wedding and Vietnamese grooms are no exception. So, if you'd really like to surprise your family with some traditional music but can't afford or find a proper band, why not buy some popular Vietnamese wedding CDs such as "Ngay Tan Ton" or "Mung Tan Hon Da vu Vu Quy 4". Ask your DJ to spin a couple of these tunes for you. It's sure to be a welcomed surprise and will win you big points with the older folks in your family. Go to CD Import Plus to find even more Vietnamese wedding CDs.

SAY IT WITH SILK
If you're totally lacking creativity, there are easy ways to be traditional, according to Lihn Nguyen, a Maryland-based photographer who has photographed many Vietnamese weddings. He says, "It is a custom for the groom and his wedding party to walk to the bride's home." Nguyen explains that the groom and groomsmen bring gifts wrapped in red silk and escort the bride's family to the ceremony after saying some prayers. It's a simple custom that is very symbolic, and according to Nguyen, looks absolutely beautiful in pictures.

[ For even more Asian-inspired wedding ideas, look at Shu Shu Costa's book, Wild Geese and Tea: An Asian-American Wedding Planner Riverhead Books, 1997; $15.00), or rent Ang Lee's movie, "The Wedding Banquet."]

Vietnamese Brides are also encouraged to change into as many different outfits throughout the duration of her wedding day.  In a Vietnamese proverb, it is said that the more times a bride changes into various outfits during her wedding day, the newly married couple will have lots of good luck for their marriage.