I hadn't really thought much about what the mothers were going to wear to the wedding. But yesterday while we were out with my FMIL she mentioned she had seen a blue tie dyed skirt at her local Goodwill and she thought she could wear that with a brown blazer. His mother is not the kind of woman that enjoys shopping or clothes in general. (Up until a talk my FI had with her a year ago, she would probably still be going without a bra in public.) At first I thought she was kidding and brushed it off. But when I found out she was serious I am now worried. I had assumed the moms would each purchase a nice dress, possibly with a matching jacket. Nothing crazy fancy just something flattering and occasion appropriate. She's going to be in the spotlight as the Mother of the Groom and I feel she should be proud of this and dress up. My FI is her only child and is this is a one time occasion. Especially since we want some great family photos taken and also that his stepmom will be there and we want her to feel confident while meeting my FI's dad's new wife (as she is very vocal about being apprehensive about it). My FI is in complete agreement that she should dress up more. He thinks we should offer to purchase her dress or even a dressy pant suit.
My FMIL has no sisters or women close to her to take her under their wing for this. She doesn't have any female friends at all. So, I want to suggest a day of shopping together possibly with my stepmom to go too so that it's a fun day out. But I'm kind of worried about offending her, or wondering if I'm even in the right to make suggestions on what to wear. I feel like I'm completely in the wrong and I'm breaking all kinds of ettiqutte.
Surely there have been other brides in a similiar situation. What would suggest I do??