I use Squinge's mod in my game- 
http://www.insimenator.org/showthread.php?t=7238The only time I've notice the body revert back to the maxian default is during the "bump" while wearing the teaching/learning helmet (the one with the light bulb).
As for wedding clothes, I've converted some of the simpler ones from 
http://www.pronupsims.net/in bodyshop.  Unfortunately, they have asked that there be no redistribution of their work.