Hello! I just finished the Playtime tunic in an interlock knit, and used my serger for most seams, including attaching the bodice to the skirt. Now, I'm new to serging and new to knits, so perhaps I shouldn't have used my serger for this seam, or taken other precautions. But it seems that this seam became stretched in the process of sewing it together as now it is about 2-3" wider than the version I'd previously made in a woven. Any ideas what I did wrong, or if it's possible to narrow the dress? The way the sleeves are attached would make it difficult to just narrow the side seams.
Thank you