hem and this is how I did mine. She also has a page of Q&A's for this dress if you need anything cleared up.
Total Time: If I could sit down and sew uninterrupted if would have been 3 hours.
Total Cost: I am not quite sure since I bought enough material to make 3 dresses and it was about 2 months ago. Most on-line places have knits for $10/yd but I was lucky enough to find some cute ones at a local fabric store fr $6/yd. Just keep your eyes open and be patient.
I do have one tip for you to make your fabric go further. Since everything is cut on the fold in this pattern I folded my material narrower to get more out of it. If you are visual like I am this is what I mean.
(Sorry I didn't take pic's while doing folding so this demonstration is with a piece of paper)
Here is you material/(paper) unfolded.
Go ahead and fold it like you normally would in half. Then iron it and unfold it.
Your pattern pieces should fit just fine on that. I used the largest pattern and made it a smidgen bigger since a 5 would be to small on my oldest monkey. And my pattern fit perfectly.
Go have fun with this dress it is super quick and easy!