My mum as bought an outfit from jacques vert for my wedding. It sells sets that are very mother of bride looking.
When she was shopping for an outfit for my brothers wedding a couple years ago she went to.
Catherines of partick, wish (Clyde st), Rita (trongate), you'll also find some bridal shops sell mother of the bride outfits like lady g in st Enoch square etc. she ended buying a dress from phase 8 and a jacket from Karen millen for my brothers wedding...
Met: November 2009
Married to the love of my life: 14th May 2012
Looneysh's wedding report: http://www.hitched.co.uk/chat/forums/t/321627.aspx