Mad for Plaid

I think that we've all noted the ressurgance of plaid in the fashion world over the past year- most notably D&G's fall campaign. When I looked through images, I noticed that Tay has quite a few plaid shirts of her own...what will the next plaid be?

And also, can someone please tell me the difference between plaid and tartan? I've been wondering....

All plaid shirts thrifted