Take a good look at your fabric's grain before you do anything. Some fabrics can be wound off grain on the bolt.
If it looks off, then tear a strip from selvedge to selvedge which will stay on grain. You can sometimes reblock fabric.
I made quite a few colorblocked shirts using good quilting cotton. You see off grain when you lay out a clothing pattern.
To be fair, it's usually the lower priced cottons that can be off, but if the cheaper cotton is the color and pattern you want, you use it.