I can't, and don't want to, sew this long stripe in hand as the sleeves. I cut the leaves with one cm allowance on both sides, sewed it to the same width green stripe and folded like this. Ironing.
I put the black stripe's edge to the dress' one, right side to right side. Ironing like this. I folded it along the line that's on the right now and sewed (on the face) just between the green and black.
Bingo, stitched are almost invisible from the face side :-D Yeah