I wash all our stuff on a one hour 40
Degree program, and it all shrinks. Washing machine was new this year. Mostly I buy cotton stuff for the kids, maybe not the most expensive brands, but my posh organic cotton tops have all shrunk and feel so tight too. Maybe wearing and washing too much? We don't have a tumble drier, so either line dry or I have a big airing cupboard with hangers and rail. I haven't put on weight. Going to have to try to wash at 30 now 🤔