It has a very ethereal, light and pale look. And was so simple to add. I bought a pre-gathered 1/2" lace. See the before and tutorial below. But if I had to do it over again I would have used a little wider lace.
And in case you're wondering, I bought the dress at H&M for only $35. Looks amazing with and without the sweater:)1. Add the first layer of lace from just in front of the shoulder seam to just a two inches below the armpit.
2. Add a second tier of lace underneath the one you just sewed on.
3. Add another layer but start it 3" higher than the first two layers.
4. Add another layer next to the one you just added.
5. Finally add two more layers 3" above the previous two layers. Do the same for the other side of the sweater.