Well guys, I recently posted a question on how to have 3D armor in Mine-Imator Animations and thanks to David's answer, I did some research and here's what I found :
There are two ways to have them :
Easy way : Download this skin : +Diamond : http://www.minecraftskins.com/skin/681125/diamond/
+ Gold : http://www.minecraftskins.com/skin/657282/simple-armor/
+ Iron : http://www.minecraftskins.com/skin/681147/iron/
- To have the Helmet : put everything (not the "All" option) on Alpha 0% except for the Head
- To have the Chestplate : put everything (not the "All" option) on Alpha 0% except for the body
- To have the boots : put everything (not the "All" option) on Alpha 0% except for the legs
Hard way : Change your texture pack and make them yourself and turn them into schematics and import them into Mine-Imator. But I highly recommend using the first way