I hate to be the village idiot, but I made a block today and I followed all the instructions and it came out 12 inches.
So, then I tried to add half an inch to the cuttings, but in patterns with half square triangles, I ran into major problems.
I added a border around the one square I did, but I think I'm going to have to redo it.
The other block I attempted, the bear tracks, was a disaster. I'm afraid I'm not much good at this stuff. I don't know how to sew these blocks so they'll be 12.5 inches and I thoroughly messed up when I tried.
What are you all doing to get 12.5 inches on 12 blocks?????