The MIL should NOT wear the same colour because she is not the one who gave birth to the bride. She will always be in competition with her daughter in law because the DIL has come to take the attention away from the MIL.
I think it looks really bad especially if the work is exactly the same as well!
If two guests wear the same clothes then thats ok as well but if unmarried or married girls try to outshine the bride, then that is just SAD. I really dont understand why married women wear their shaadi joras to other people’s wedding! the jora looks too heavy and uncomfortable to be walking around in and even worse so if you have a child hanging from your lap.