Yarn Weight

[Viridian]

So I do a lot of sock knitting, and it's my preferred project. I decided I needed a separate bag for that, so instead of buying one, I thought I'd make one. I got two skeins of different colored blues (subtle change) to make a bag, and I really like the fibonacchi sequence as a striping pattern.

So I found this bag that's perfect for it, until I read it requires chunky yarn. If I were to use the worsted, however, I believe it'll just come out smaller, which is what I want for a sock knitting back anyway.

Am I right in this assumption?

Pattern: Fibonacci Bag

Thanks!