Ruffles in the Back Only, T-shirt Edging

When sewing a t-shirt, it is very common to finish the lower edge with a rib knit band.

 In this hoodie, the shirt hem edge is finished with a black and white striped ribbed knit band.

I like ribbed knit bands, but I wanted to try something new.

If you look at this diagram, you will see how I used the rib knit bands at

 different levels to create interest and a fun surprise in the back of the shirt.

There are two basic ways this can be sewn.

First, use a backer base and sew the individual ruffle layers to the base.

 Or
   Vary the length of the ruffles and stack them on top of each other from the thinnest to the widest.

In this example, you can see that I layered them from thinnest to widest. Next, I placed the rib band on top, then sewed the bands together. Lastly, sew the band to the back of the t-shirt.

Topstitching the hem seam now that the 3 layers are sewn on.

In this picture, you can see the widest ruffle.The width of this ruffle is determined by how much space you need to fill, so that the front and back of the t-shirt, end up being equal in lengths.  

 What about the front hem of the t-shirt?  It's just finished the usual way, with the rib band on the edge of the hem.  I cut the band slightly less in width than the bottom edge so it hugged the front bottom a bit.