Thank you very much for all that insight!
I have search for some fashion books, but I really didn't know where to start looking, so I never read any of them xD (I have some PDF that I should give it a try, though).
I gonna check the videos, for sure!
Also, I remembered a thing that I do when I want a 'normal clothing' for a random character scene. I go to YouTube and search for any city and year walking tours. I check on the people's clothing, think if those would go with the characters style choice, and do some minimal changes if needed.
Now I only need to find the time to apply myself to do all that, but it can't be helped, haha!
Thanks again! =D