Agitation is what causes a lot of shrinkage. Higher speed spin cycle will increase this greatly.
https://www.thespruce.com/why-clothes-shrink-in-the-laundry-2146152
If the garment was cheap it is doubtful the fabric would have been pre shrunk and may even have been stretched considerably in manufacture.
Spinning isn't the same as agitation though is it? Once the washer revs up the item isn't moving around whereas agitation will more often happen during the wash cycle, especially for top loaders - more of an NA thing.
Most washing machines shake during spin cycles. Shaking is another word for agitation. Longer faster spin - more agitation.
@withered_preacher started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Agitation is what causes a lot of shrinkage. Higher speed spin cycle will increase this greatly.
https://www.thespruce.com/why-clothes-shrink-in-the-laundry-2146152
If the garment was cheap it is doubtful the fabric would have been pre shrunk and may even have been stretched considerably in manufacture.