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.
Certainly
Why not!
If you are attending as a guest then you may wear whatever pants you want. If you are afraid of being out of place you can always ask the bride or the groom. However, if you are part of the wedding party you definitely should run it by the bride or the groom.
I don't think so.
White or the color dress of the bride
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.
The general etiquette for the mother of the groom is to wear an elegant dress in a neutral color, such as beige or gray, so as not to outshine the mother of the bride (regardless of the color of the mother of the bride's dress).
they wear pinks, even yellow and orange is acceptable
For pants they wear - pants
The mother of the bride will be the groom's Mother-in-Law or Future Mother-In-Law if the wedding has not occurred yet.
yes they do.
the bride and the groom is first, then the bride and her father, and then the groom and his mother. After that the bride dance with her new dad and groom dance with his new mom.