I took my muslin of New Look 6557 to sewing class on Wednesday and my instructor helped me take it in. Now it actually fits!
Looks much better, no? I didn't iron up the hem, but just know that it will end at my knees instead of mid-calf like it is now. I cut out all of the fabric and lining pieces on Sunday, so I'm all ready to start sewing on Wednesday at class. I hope this dress goes together faster than my Passport!