I'm kind of surprised there is not much craft information in this forum--no "how to" stuff.
I just came across an interesting article on how the costumes in the new horror film "Us" were key to establishing character. MAJOR SPOILER ALERT!!!
To Understand Us, Pay Attention to the Outfits
The deeper meaning behind the red jumpsuits, the leather glove, and Lupita Nyong’o’s costumes—according to the woman who designed them
As we all know, a picture is supposed to be more powerful than a thousand words. So it's difficult for a writer to convey in words all the information that costume designer Kym Barrett packs into her visuals, but I thought it was very interesting to see what color and types of clothing could reveal.
I have always done a lot of character development through body language. It was an odd concept to the other people in my writers group, but whenever someone asked about a problem she was having with a character, I always asked how a character stood, carried their weight, etc. I don't know any of my characters until I can conjure up their feet.