Melanie, since the dress has pinking, you can look at a long seam and tell whether it was pinked by hand or machine.
When pinked by hand, you can see when the shears were opened to pink the next section. It's rarely a smooth line.
Pinking by machine was done by 2 diff. machines. One was a sew-pink machine which pinked the edges immediately after the seam was stitched and the garment was still under the presser foot.
The other was a pinking machine which only pinked.
If this dress were pinked by machine, it was the latter because the two edges are pinked differently.
The application of the seam binding on the hem is a bit different from home sewing. 1. If the home sewer had pinking shears for the seams, she would have probably used them on the hem too. 2. The seam binding has some ease on it which looks more like someone more experienced sewed it on.
Thanks for info on Pattern wiki