They look identical in real life, too -- and for the record, are sized identically as well. And the cost for a new EKTORP slipcover? $129.00. S0, for the price of one new replacement slipcover from Pottery Barn, you can get two from Ikea and still have money left in your wallet. Granted, you're a bit more limited in selection from Ikea (they only sell cotton slipcovers, while PB has extensive fabric options ranging from twill and denim to velvet and linen), but their patterns are definitely more modern than PB's if you're looking for an update.
And so, my lovely chair was saved (and so was my cash): the cranberry twill slipcover from PB was replaced with a white cotton slipcover from Ikea and has been moved to our bedroom, safe from Subi's love.*
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* - For the record, I'm allergic to cats -- and yet, somehow, I live with two: Subi and Clio (both rescue tabbies). To minimize their ill effects on my health, neither cat is allowed in our bedroom. As a result, I've also developed a habit of keeping any furniture, rugs, etc. that the cats are particularly fond of in our bedroom as a prophylactic measure.