I had planned to post this yesterday in honor of Throwback Thursday - oh well. This was posted back in 2009 but I thought it might still be helpful for anyone looking for a solution to cover an old style mirror medicine cabinet. Here's what I did for the 1950's one in our hall bath. I found a lightweight 20"wide X 24" high mirror ($25) and attached it to the original mirror with eye screws and picture hanging wire. The cabinet still opens as widely as it did before because the mirror just clears the wall.
I'm happy to report that 5 years later, it's still working beautifully. Hope you have a great weekend. Michele