Now for my question...
1. Why do they seem to take some parts/passages of the Bible literally and others figuratively?
Because it suits their cultiness. Look at this link. Search for Jehovah's Witnesses on the page; they are on there three times.
http://www.spiritual-research-network.com/cultsmisreadbible.html
As is often said on this site: Let's review: It's a cult. Good luck in life bleak. I would suggest researching cults to make sure another doesn't try to recruit you, and get some therapy to see why you were vulnerable to the Jehovah's Witnesses.
Edit to say: The reason suits are required is to make you different, a cult tactic. The bible only talks about modesty, but when they talk about 'dress and grooming' they bring up scriptures on modesty to enforce the dress code that goes waaay beyond modesty.