Hi there! I'm glad you like it. It was super simple, nothing technical at all. Like I said in the description, I put it together in the hotel room using hot glue since I didn't have access to a sewing machine.
For the sleeves, I measured how long and wide (wrapped around my arm) they needed to be and then added about 4 inches to the length and 2 inches to the width. I hot glued the hem for the end of the sleeves and then hot glued the long part together so it formed a roll, I guess you could say. I slipped my arm through the sleeve/roll, made sure it fit, and then hot glued it to the inside of the sleeve on my black shirt. For Rose's symbol on the black shirt, I used iron on transfer paper.
For the scarf thing, I simply took my fabric and cut in into three or four long pieces and then sewed them together so that they formed one long piece of fabric. I can't remember if I even hemmed it or not. I think I just tucked it over.
I'm kind of horrible at explaining things, so if you need me to reexplain something or have an additional questions, just let me know.