I found the images of Dr.Gel without a hat.
http://zozo.jp/shop/white/goods/3755040/
http://zozo.jp/shop/zozomesse/goods/3775893/
Space Dandy is now collaborating on a fashion project and these images are for it.
(http://space-dandy.com/blog/?p=587)
Looking at the second one, it seems that Dr.Gel has long toes.