I'm normally all for people wearing whatever makes them happy, and will try to help people find something, but in the hopes of helping just a teeny tiny bit, you do not want these shorts.
As the girls at GFY so nicely put it: "1) At what point in her day did she say, "What this torn white tank really needs is a plaid diaper"?
You might, however, be able to find some cute plaid shorts at Urban Outfitters or Forever21 for a reasonable price.