That is so stinking cute! Is the strap attached or is that your.. ahem... bra strap?
no, its just my bra strap. I'm thinking of attaching a strap from a bra to the shirt (so it is adjustable and less likely to fall off.)
since ppl have had some intrest in making it ill post a (sorta) tut.
to start, take a regular t-shirt pattern (i used a good fitting tee that i traced on to paper) and make it into a one shoulder tank top like this:
make two patterns
then draw on your stripes and label them...
next, cut the pattern apart and fit the pieces onto your fabric (make sure that the knit is facing the the right direction on each pattern, you might want to draw arrows on the pattern while it is still together to make this easier)
when you cut out your pattern from the fabric, add on a 1/2 inch all around (for seam allowance)
this picture should explain both:
as you cut your pieces out, keep the pattern with each piece and keep them in order. this will keep you from getting mixed up later.
then just stitch every thing together (in order, red to orange, orange to yellow and so on and so forth) on your machine with a medium sized strait stitch without stretching your fabrics. you'll get the best results if you let the machine pull the fabric through instead of forcing it in, or pulling it out of the feed dogs.
this is a picture of the inside of the shirt to demonstrate this:
use your other copy of the pattern to cut out the back (make sure that its a mirror image of the front piece you just made so the shoulders line up)
when you get the front all together, stitch the back on to it and hem the edges.
ta-da!!!! your done!
feel free to ask questions for clarification