What's cuter than a platonic solid? A cat dressed up as a platonic solid for Halloween!
This instructable details the making of a soft quilted tetrahedron costume for the more patient of my two cats.
Step 1: Choose fabrics and preprocess them
The first step in any quilt is to pick out fabrics. You will need at least 4 colors, two for the contrasting triangles, one for the outside border, and one for the backing. I was working with fabric scraps from other quilts, so I used more colors but whatever you've got will work. Be sure to wash, dry, and iron all fabrics at least once before you start working with them. There's nothing worse than finding a finished product ruined in the wash by runny dyes or fabric shrinkage.
You'll also need an attractive color of quilt binding. Binding can be purchased at most fabric stores (I use Joanne's). The binding is a cloth strip that will sandwich the outer hem to create a finished edge. Also make sure you have a color of thread that matches your fabrics.
Step 2: Cut triangles and piece them together
Using a rolling cutter, measure and cut equilateral triangles from the chosen fabrics (the size will vary depending on the size of your cat). You will need 9 of one color and three of the other. Pin the triangles together one pair at a time, sew, and iron the seams flat immediately. Never skip the pinning or ironing steps! Quilting is all about patience; you will get far far better results if you are methodical.
Measure a strip of your 3rd contrasting fabric for the outside edge; the border shown in the pictures is a 2" strip. When the 4 triangles are sewn together and ironed into a bigger triangle, pin the border on the edge and sew in place. Once one edge is attached, cut the edges flush, iron flat, then repeat for the other edges.