https://classic-blog.udn.com/92d06122/184542273
Before you start your search (around the six- to eight-month mark), brush up on mother-of-the-bride apparel etiquette.

https://jelenamterry8476.collectblogs.com/84032963/
Opt for a well-cut, flowing sundress in a breathable fabric—and
pair with dressy sandals to pull the look collectively (while still feeling comfortable on the sand!).

https://kerrynamos5774.blog2learn.com/87081791/
For blogger Jenny Bernheim's fancy rehearsal dinner,
her mother wore a Carmen Marc Valvo costume, full with a beaded illusion cut-out.

https://classic-blog.udn.com/1e50fc88/185676265
However, many trendy girls use this advice as extra of a suggestion than a strict rule.

https://annavaurora6595.collectblogs.com/84071284/3
So, on the very least, both mothers will need to wear
colours that complement the opposite.