Basically you slice up a tshirt into ribbons and then weave it strategically back together.
Here's a variation on this that takes the basic shape of a sunflower.
These tshirts make cool bikini cover ups. You can also wear another colored camisole underneath.
And the best part is: it's easy to do!
Step 1: Stuff
cutting pattern (attached) (the first four pictures can be printed on 8-1/2 x 11 and then taped together to make an 18" wide design
Step 2: Cut
Lay the pattern out over the front or back of the shirt.
If you have a piece of wood or a cutting mat, you can slip than inside the shirt and then trace the design with a rolling cutting blade. If you can just trace the design with some chalk and then cut it out with scissors.
Step 3: Weave
Basically, you pick up one strand, thread it underneath previous strand and keep going round like that.
Once you make your way back to the starting point, you can sew the last two strands together or I just used a safety pin as you can see.
If you mess up, you can just straighten the fabric back out and start over.
I still don't quite get the best way to start it and end it, that's why mine looks like a caffeinated spider web at the bottom.