I figured I might as well take some pictures as I made it to show you how to make them. The old dinosaur hoodie tutorial didn't have instructional pictures so hopefully this helps.
You will need: 1 hooded sweatshirt, felt, scissors, needle, thread and an iron.
Step 1: Cut the felt into diamond shapes.
I used 13 diamonds (mine are about 2" x 4") for a 4T sweatshirt.
Step 2: Fold the sweatshirt in half down the middle and iron, making sure to leave a visible crease.
Step 3: Lay the sweatshirt flat with the back face up. Place the middle of the felt diamonds next to each other (without overlapping) on the crease.
Step 4: Sew down the middle of the diamonds (I used my sewing machine but you can do this by hand).
Step 5: Fold the diamonds in half to make a triangle. Press with iron.
Step 6: Sew the triangles closed.
If you want the triangles to stay nice and stiff you can use interfacing.
After making your hoodie, you may want to order some custom hats to go with it, to complete your outfit.
This dinosaur sweatshirt would make a great gift or even a fun project to sew with your kiddos. it really doesn't take very much time and your kids will love having their own dinosaur hoodie.