How to dress when going to a wedding?

Are invited to a wedding or are witnesses, and did not know how to dress?
What clothing should be eligible if you are a guest at a wedding?
 If you are the mother or stepmother, it is necessary to avoid light colors such as ivory, champagne but also black and choose soft colors: pastel, pink, chocolate for a non-summer wedding, beige, green and bronze. In the case of fabrics, there are no real rules though be privileged noble materials: taffeta, silk, byrynxhyku, organza. Regarding the length and shape, the ideal is to choose a dress to the knee with a long jacket or short, but with long sleeves. It is also possible to wear a dress with a jacket torso.
For other guests, advice on colors to avoid are the same. If a person takes part in the celebration, may wear a dark dress combined with simple accessories. But if it takes part in the dinner, it would be nice with a long half dress. Also note that for girls, there are some very beautiful outfits with 2 or 3 pieces with a length above the knee are not age nor too small nor too large. Finally, if you are a witness, choose a dress that reaches the knees or pastel colored marine.
What is the rule about hats?
They are normally reserved for people close to the bride as: mom, mother-in-law, witnesses. It is true that they give the effect of a "good marriage." You need to combine with bag hat, clothing or shoes.