Largely a myth...The only problem with this is that the poor kids get picked on and bullied for not having the latest trainers etc
And how do you explain 'mufti days' where pupils are encouraged to wear their normal clothes in return for a 'charity donation'?
No, they'll be buying twice...also clothes that they wear outside of school will get ruined as they tend not to be as well built as uniform, long term it won't be a saving for the parents as they'll be buying more "non uniform" clothing.
If you believe that uniforms are built to last then think again...
And guess what, kids usually outgrow their clothes yearly!
Plus given the cost of school uniforms where they can only be provided by a certain supplier, theft has rocketed!