The loveseat I covered was unusual, with a rattan bottom and a rounded back. When I first put this slipcover on, it looked like the Saggy Baggy Elephant.  Then I got some upholstery tacks, both straight ones & corkscrew ones, and that did the trick. I used about 30 of the corkscrew ones & 24 of the straight. It looks quite nice now. It seems to be good quality fabric and stretches amazingly.