Of course she can. A woman can wear her hat wherever she wants. Hat rules apply only to men. For a wedding, though, she ought to not wear a ball cap.
Why not!
A groom on a Jewish wedding day wears what you wear in a English wedding
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.
they wear pinks, even yellow and orange is acceptable
The best wedding clothes they can get.
It is up to her. If you're speaking about American 'pants' (English Trousers) then it is her decision as to whether she wears pants, a skirt or a long dress. If you're speaking about English 'pants' (as in underwear), then most of the time she should - as it is just common courtesy - especially if it is windy. No one wants to see their Mother's bits.
no
No, it is not traditional for the mother of the bride to buy a nightgown and pajamas for the bride and groom. Sometimes the groom may wear just his underwear; just wear pajama bottoms or even be in the buff. The bride should pick out a nice negligee for her wedding night.
Not if your the groom
if he wishes to, then yes
Black.