I am making a kimono style (wrap) sweater vest for my 3 year old daughter... I am using two yarns together. After doing the back for a specific length, the pattern says to cast on additional stitches at the start of the next two rows to begin creating the sleeves. When I tried this it messes up... the yarn gap in the stitches gets larger and larger between each stitch. If anyone can give me any tips I would appreciate it. Thanks!