School shirts for a busty teenager

[planesick]

Where do you buy white short sleeved school shirts..my daughter is wearing them from George (size 16 years), but if she keeps growing she will need a larger size and I can't seem to find any...all recommendations are gratefully received.

M&S are better size-wise. My DD has left now but that was my only option because she’s busty.

I also found M&S are better for my daughter who is busty.

M&S revere collar school blouses go up to a 39" chest

My DD got them from Next. She also wore a flesh coloured thin silky vest underneath as hated her bra showing through, plus it covered her cleavage where the shirt gaped.