We just make sure our slipcovers are machine-washable & dryable. The cat hair is usually picked up by the dryer filter.
This is a useful tool for removing cat hair from upholstery:pet hair squeegee
You can also get a roll of wide masking tape, and pull out the first foot or so, and roll it backwards around the roll of tape. Then you roll the tape over your clothes and it will pick up the hair. When that layer of tape is used up, just tear it of & pull some more around the roll. Less expensive than a standard lint roller, and works really well.