Grandmother of the Groom Dresses - The grandmother of the Groom may not be the star of a wedding, but it's still a very special day for her. So finding an appropriate Grandmother of the Groom dress that she likes and feels comfortable in is essential.  Again, a formal grandmother of the groom dress is traditional, with it being important that you're aware, if possible, what the brides grandmother is planning to wear - to avoid any obvious colour or style clashes. The formality, style & design of your grandmother of the groom dress will depend on the time and location of the ceremony and reception.