The best wedding clothes they can get.
Most traditionally, the groom would wear the skull cap during a Jewish wedding. In certain Jewish communities the prayer shawl is draped over the bride and groom while they are under the Chuppa (wedding canopy).
Yes! White is always appropriate for a Jewish groom, just like the Jewish bride. Orthodox Jewish grooms often wear a white robe called a kittel.
Yes. If the groom is very religious, he might wear a suit jacket of extended length.
By the groom.
They do, but might need some help if they don't wear ties on a regular basis.
The groom's father is expected to wear formal clothing to the wedding.
To wear one's uniform for your wedding or not is a personal choice. If the wedding is on-base; a military wedding where the bride and groom come from the church under the crossed swords of their fellow officers is most impressive - if that is what the bride and groom want.
no
At Orthodox Jewish weddings, the groom is escorted by both fathers and the bride is escorted by both mothers. At modern Jewish weddings, the bride and groom are escorted by their parents.
if he wishes to, then yes
Not if your the groom