All the clothing is symbolic. According to this website
, the green apron is a symbol of life. "The fig leaves on the green apron are a fruit known for the countless multitude of seeds. This green apron full of fruit seeds is worn after Adam and Eve are cast out, and strategically over the loins symbolizing the new power to procreate, be fruitful and multiply."
It's hard to find accurate information on it because active Mormon church members believe everything in there is sacred so they don't usually tell others about it, so any info you get from websites is probably from someone who used to be a Mormon who was excommunicated or otherwise left the church.
Baptism for the dead is pretty much what it sounds like. They baptize ancestors who were not baptized while alive because they believe if they are baptized after death, they'll be able to join their family members in heaven. The names of people have to be submitted by families, I believe.