Halter dress help

[Sylwa]

Hi ladies and gents 

I had this pretty fabric sitting in my stash for a year or two and decided its time to make something simple for my daughter. I drew the dress, cut out a simple pattern and all that, did what I could last night and then had my daughter try it on this morning, it fits nice except the back doesnt fit close to body, as in it kinda stands out and there's a lot of space between her back and the dress, so I was thinking about putting darts in it but then she wont be able to put it on without a zipper. I also thought about just ruffling it a bit but then I wouldnt be able to put on the nice green rim I wanted all around. Are there any other solutions for this? Or would be the easiest thing to just suck it up and have the rim only on the front and ruffle the back with elastic so it fits nice and she can still put it on?
Hope this makes sence. I took these two pictures with how much I would need to ruffle it so it fits nice. She ran off before I could take a picture with the dress on her 

[lovesclutter]

Make two ties out of the ruffle fabric, sew to sides and tie in the back.

[Alexus1325]

You could sew in some narrow elastic at the same time you finish the green binding. Just stretch the elastic as you sew and you can get it an inch of two tighter.

[nicholasliggins]

Its really pretty,especially the cute tiny prints on this fabric.It will try it for my little princess.

[Sylwa]

thank you for the advice everyone. I ended up just putting elastic in the back part. I think I cut the back too low but it works for backyard summer play. It will fit much better this summer as she's grown a bit and there is lots of room because of the elastic.

[Alexus1325]

Oh my gosh, is she ever adorable! I love how it turned out