Originally Posted by MiaZilla
Could I, like, take out the seam and then sew in a strip of knitted fabric?
Yes, good idea! A sleeve gusset!
I did this one time...on a cardigan that was too small for my 'beam'.
I knit a 20 st wide 'gusset'...gradually decreasing out the extra 20 stitches...so that by the time the 'gusset' was the right length to fit from bottom edge to armpit...I was down to 1 st.
So, using the color of Malabrigo (applewood)...cast on enough stitches that will give you the extra width for your sleeve. Knit the first so many inches to match your cuff...and from then...just knit plain st st. Remember to include 1 extra stitch at each end of the row for the seaming edge stitch.
When the sleeve gussets are done, you will have to seam gusset 'side A' to sleeve edge 1...and then seam gusset 'side B' to sleeve edge 2 (double duty in the seaming department)...but it will look great. Please use mattress seaming, if you don't already use it. It's almost invisible!
Good luck! Please post a photo for us when you are done!!!
Here is a photo I took of my cardigan's 'gusset'!!