If it's printed, I don't think that blocking it is going to help all that much, (but it won't hurt either). This is why I avoid buying plaids, stripes, even small repetitive prints. Drives me nuts if it's cut off pattern.

It is hard to find a plaid or stripe absolutely straight. I bought medallion fabaric and spent $$$ on all the fabric needed for a pattern. The medallion squares were not straight. I purchased an 11 1/2" square ruler just to make perfect cuts and they are still off. I knew if I bought more fabric I would still have the same problem. I just went ahead with the quilt top and overall am pleased with the results. If you can get a refund or exchange go for it. If not I would go ahead with the ideas posted. Good Luck to you!

That's why I very rarely buy plaids or stripes. I would try blocking it the way others have suggested. I doubt they will take it back.

if you can't return it... a short time ago, someone posted a picture of a double wedding ring with plaids in the arcs... crookedness wouldn't show there. sorry you're having a problem with it.

This is the reason I don't buy many plaids or stripes.

I would spray it with water and then iron it into shape. This can work but often plaids and strips are crooked on the bolt. They tend to stretch them too much and also don't cut them straight. Some don't give a damn they just want to make a sale.

Here's the result of the crooked fabric
 

I kept it bc I couldn't remembered where I ordered it from. so.. it's ok

Good save Sweetpeaches, no one will ever know.

I have found that you can use the "wavy/unsquared" plaids in things taht aren't squared blocks...use them on point blocks and it's not quite so noticable or use the fabric in applique" designs. Many times the plaids and stripes( especially crosswise) are not straight on the grain...go figure! You'd think the manufacturer would check this out, but then I don't think anyone has a "proofer" now days...and so much is made in other countries and for a dollar a day, they don't care about quality. Glad your bag turned out well. Cute purse!

I would certainly try to return it. I am a Longarm quilter and find so many fabrics that are off grain. Even if it is not obvious, it will cause your quilt not to lay or hang evenly.