My wife has made two very nice cardigan sweaters out of wool and twice by accident she washed them and they shrank because they were wool. This was knitting and not crochet but it was a lot of work and she literally cried when we discovered the sweaters in the laundry.  

If it was me that did this I would be dead.

OgFOMK

I used acrylic! it's the cheapest and easiest to attain. Would love to use wool for something like a sweater or vest, but when I've tried clothing, I have hated the results.

plebpoet

Crocheted market bag

It looks great! What sort of fiber did you use?  I think linen fiber is great for this sort of application - it's durable and feels nice, but it probably doesn't stretch as much as cotton, wool, or acrylic.  On the other hand, wool has some natural anti-microbial qualities.