Cosplay costume sewing tutorial- armsleeves

Hmm, got this tailoring order for a customer;) not sure what is the name of this character though. ( my anime knowledge is super limited) anyone who knows can tell mi? Thanks in advance;)
Today I will be touching on the armsleeves part which takes around 30 mins to complete.

Items u need:
1: blue cotton in the right tone around 2m.
2: blue thread
3: blue ribbons (mine is 15mm)
4: button hole function in your sewing machine
First you need to draw out the pattern for the sleeves. I just estimate n draw directly onto the fabric and cut them out.
2: hem the upper sleeve portion.
3: sew buttonholes the length same as the width of your ribbon. The markings are 1inch ,1/2inch, 1inch, 1/2inch all around about 1.5inch from the upper hem.
4: sew the back seams, bottom seams and front seams till 20cm from the folded portion.
5: serge or neaten the raw edges
6: fold in the sleeve opening seams n sew.
7: add blue lace to the upper hem and the big round thing to the bottom of the sleeve and thread the ribbon through the buttonholes. tada! All done. (I haven buy the lace n do the round thing yet, will put them up when I got them)