Vest tops for 8 yr old at this time of year - where?

[feetheart]

I need to find 2 vest tops - a black one and a white one for my daughter for her dance show in 2 weeks time.

Has anyone any idea who is selling them at this time of year?

.

These but they might be a bit warm.

Thank you.
Might have to go that way if I can't find anything else.