HIGH SCHOOL MUSICAL COSTUME HELP

[Mumsaysno]

My daughter wants a HSM themed party and would like a dressing up outfit but all the ones online to buy are about £30.

Does anyone have any ideas how I could make a costume or customise a cheap dress etc to make a prom style outfit.

Thanks

Thanks have seen a cheerleader one is Asda for £12 but not big enough sizes as daughter will be 10 (it is for her 10th birthday).

Will have a look in Sainsbury