Oh! I almost forgot to answer where I got the pictures of John Mollo’s costume designs for Ben Kenobi from.
Mollo’s drawings of Ben of him in Tatooine farmer garb are from The Making of SW and the 1979 The Art of Star Wars (which also provided the McQuarrie drawings of Ben in Jedi robes). I think I found the Mollo picture of Ben’s Jedi gear while searching on the Internet, though.