Sweater Sleeve question

I have finished knitting a sweater. The sweater was knit all in one piece. I have sewn the side using the mattress stitch, but I’m not sure if I should also use that for the sleeves. When I was knitting the sweater, all the increases I made for the sleeves have created what look like steps on the edges. When I try to sew with the mattress stitch it does look right. I’m not sure if I should use that or another stitch.

:knitting:

Yes, usually you do mattress stitch on the sleeves too. Many people do their increases 1 st in from the edge so it makes a smoother edge. Since you didn’t, you can use whatever will look good on that seam.