To do this all I did was to cut 1″ strips of the knit fabric. Knit fabric naturally rolls to the wrong side and with this fabric it was hard to tell the difference between the right side and wrong side. I put a 4.0 twin stretch needle in my machine and matching thread and sewed the strips with the curling wrong side up. I sewed two 1″ strips about one inch from the bottom.
I only serged one sleeve and side seam so that the main body would be one flat piece at the hem line. I sewed the two strips to the bottom while it was flat and it was easy to do. The last step was to sew that side/sleeve closed to finish the t-shirt! Fast and easy!!