One of my favorite best plus size mother of the bride dresses is the Foiled Draped Mini-Dress from Adrianna Papell. It incorporates black, pink, and gold, and would be lovely for a semi-formal affair.

Adrianna Papell Sequined Dress. Show off your shoulders in this Adrianna Papell Sequined Dress ($259). Adrianna Papell Plus Size Sequined Cold-Shoulder Dress. From. $259. $259 at macys.com.