Making a Deerskin/Buckskin Shirt: The Tribe of Benjamin: This is an excellent video because he demonstrates the whole process and only uses primitive tools.
Making a Deer Hide Bush Hat: Rambooutfitters: I would have never thought of this! He actually uses rawhide, but does processing that makes it close to tanned, so I listed this here. It's ingenious and makes a great hat!
How to Make Moccasins without a Pattern; Frontier Trading Post: A good step by step for a simple moccasin.
Link to Debbie Tremel's Pinterest collection of Clothing