If they don't fit you should not have bought them. These are simply nonsense, old wives' tales at the kindest.
They may have been cheap but they were far from a bargain, throw them away and remember to buy the correct size next time.
Leave them to dry naturally, don't 'help' them. Then use a suede brush to 'clean' them. The final thing is look at the weather forecast next time and certainly do not wear anything decent to ride a bike - motor or push which are equally as bad as one another.