Hey franz! I did a quick walk-through video of how I did my World of Warcraft Rogue Shadowcraft shoulders. I received a lot of questions about my Death Knight shoulders and it’s basically the same principle. If you have any questions, feel free to comment below! Hope this helps! ^_^
In the build I used hot glue, industrial-strength velcro, plastic buckles EVA and craft foam. All of these materials can be found at Harbor Freight, Home Depot and Amazon.