Most people buy a sofa cover the way they buy a bandage, grab the first one that says it fits a "three seat sofa" and hope for the best, then wonder why it looks like a fitted sheet wrestled onto a mattress by someone in a hurry.
The difference between a cover that looks intentional and one that looks like an accident is almost entirely in the fit and the fabric weight. A good one has some structure to it, a thicker weave that holds its shape instead of clinging to every cushion seam and crease, with elastic or drawstrings at the base that actually cinch rather than just sitting there decoratively. Check the corners and the arm pieces specifically, cheap covers bunch at the arms because they're cut as one flat rectangle and just hope gravity sorts it out. A cover with separate, shaped arm panels and a proper tucked hem at the back will sit like upholstery instead of like a costume. Stitching matters too, double stitched seams along the high stress points, the arms and the seat front, hold up to actual sitting, not just styling.
Color is where I'd be boring on purpose. Busy patterns and bright colors look great in a listing photo and then you live with them and realize every throw pillow you own now fights with the sofa for attention. Oatmeal, a soft gray, a deep charcoal, these read as furniture rather than as a cover, and they forgive crumbs and pet hair in a way white never will. A cover that's trying too hard to look like "real" upholstery, with piping or a sheen to the fabric, tends to read as cheap the moment you touch it, so matte and slightly textured wins every time. Where this goes wrong is next to a patterned rug or busy curtains, a cover is already a compromise shape wise, it doesn't need to also compete visually, and it looks especially rough in a small room where the sofa is the first thing anyone sees walking in.
Over months it will loosen slightly at the seat, that's normal, a quick retuck after vacuuming fixes most of it. Wash cold, skip the dryer heat if you can, high heat is what kills the elastic and turns a snug fit into a saggy one within a year.
I'd put the first one on a sofa that gets real daily use, the one in the main living room where people actually sit, not the good sofa nobody's allowed near.
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