Lilly Pulitzer knit dress

This is an A-line type knit dress my Lilly Pulitzer. Very cute on. Size medium. As I was photographing it I noticed that it had a seam down the back on the right hand side. I have never noticed this and I bought the dress new. No idea why it is there...Maybe it is supposed to be that way? At Any rate, it does not take away from the look of the dress. The dress has never been washed, always dry cleaned and is close fitting. It will hug in all the right places! We are a clean and smoke free home