Mormons have some strange hangups about men having beards (men in leadership roles are expected not to have beards). Women always wear dresses, men wear white shirts and ties, and unlike what others have said on this thread, that’s not just a Utah thing. That’s pretty much everywhere in the U.S. Those that experience otherwise are the exception, not the rule.
But as Catholic I must honestly say I would be embarrassed to show Mormons how most Catholic dress for mass. Catholics dress for mass like they really don’t give a hoot about where they are when they are at mass–flip flops, shorts, jeans, t-shirts, athletic jerseys. They just don’t seem to care at all. How many times have you heard fellow Catholics say, “God doesn’t care what I wear.”? Personally I think that’s a lame excuse to be lazy, and it reflects the wrong attitude. Like it or not, in our culture how we dress indicates the importance we attribute to the occasion. This is why we dress up for weddings, graduations, business meetings, dates, proms, etc. But most Catholics dress for mass like they are going to movies, and usually not even that nice.
So basically I admire LDS for at least trying to demonstrate the importance of Sunday worship by how they dress. They are a little too stringent about this in some ways, but they make us Catholics look like a bunch of slobs. Maybe the LDS leadership saw how we Catholics dress and realized that if they give an inch the folks will take a mile just like we have.