Mother of the Groom outfit for larger lady with small budget

Hi, wonder if anyone can help, I am getting married soon and my mother-in-law to be still hasn't made any effort to find an outfit. She is quite a large lady approx size 24. She also has very little money to spend and we can contribute a little but we are still trying to finish saving as it is without more unaccounted for expenses. She is going to be 60 this year so it can't be anything too young either. Can anyone suggest places to try looking for an outfit, she stays in Edinburgh if that helps.

Thanks x

i would check ebay out, there are many ladies who sell their outfits (mother of bride/groom). You can get designers like Cattiva there fore under £100. If you know the size and measurements you can always ask seller to measure for you.