It should be possible to step into a laser-measurement booth, take your measurements, choose a style and have a new garment custom produced on the spot. It might waste a bit of fabric, and it might be quick and shoddy, too, but if the world moves any further towards disposable fashion, then these highly trendy clothes don't even need to last long at all. Plus they'd be a perfect fit.
Mokalus of Borg
PS - And you could re-stitch them if you wanted them to last longer.
PPS - Or just get new ones.