When you print it, make sure your printer is set a 100% or “full size” – NOT “scale to fit”. It prints on four 8.5×11 sheets of paper, which you should line up as shown below. Don’t trim the paper at all. There is a 1 inch box you should measure to be sure it’s printed properly.
In case your little girl is not a size 4T and you’ve already drafted a flutter sleeve dress in another size, here’s how the main romper piece compares to the dress pattern:
Once you’ve printed your pattern, cut out 2 bodice pieces on the fold and 2 sleeve pieces on the fold (remember to use knit, i.e. stretchy, fabric). You’ll also need 4 shorts pieces (if you’re drafting your own, just use a pair of shorts that fits well as a reference).
As noted on the pattern, there is a slight difference between the shorts front pieces and the shorts back. In the photo below, the shorts back pieces are on the LEFT. The top of the shorts back angles slightly up from the side to the center seam. The shorts from pieces angle slight down from the side to the center seam (as seen on the RIGHT). This gives enough extra room in the back of the shorts for them to be comfortable while sitting.
You’ll want to start by sewing up the bodice of the romper the same way you’d sew up a flutter sleeve dress – follow the directions from the flutter sleeve dress tutorial all the way through, except don’t hem the bottom. (Also, I just hemmed the sleeves on this version instead of adding pom pom trim).
Set the top aside and grab your shorts pieces.
Now you have two legs. Turn one leg right side out, and slide it into the other leg, which is still wrong side out, so the right sides will be together.
Now turn the shorts right side out. You now have a top, and a pair of shorts with now waistband. Keep the shorts right side out, but turn the top inside out. Place the shorts inside the top and right sides will be together. Sew together with a 1 inch seam allowance, stretching top slightly if needed.
Now your romper is all attached together, and all that’s left is to add elastic around the waist. I forgot to get a photo of this step, so we have a fairly laughable illustration instead – but hopefully you can still get the main idea. With the romper inside out, press the 1 inch seam allowance you just made up, toward the top. Sew the seam allowance to the top, right along the edge of the seam allowance, all the way around, leave a 2 inch space. That creates a casing.
Cut elastic just shorter than the waist measurement and thread it through the casing. Sew ends of elastic together, then sew the rest of the casing closed. Hem the shorts and the romper is done!