DD is starting year 7 in September and the letter about this was received today. There have been no warnings in newsletters and the prospectus and website clearly outlined uniform requirements.
I have five blue shirts and four black jumpers (mainly M&S / BHS) which are now useless as it has changed to a logo-ed polo shirt and logo-ed jumper. The fit of these was carefully checked against DD then tags were taken off and receipts thrown out. I even ironed name tags into them no that's a lie I'm not that organised 
I may be able to return the items bought using my debit card - not sure.
Rang school and it is unfortunate blah blah but DD will not be allowed to wear what I have bought. It's a state comp but I have signed and returned the home / school agreement so I think they can insist 
Is the HT being unreasonable? I wonder how many children he has ever had to kit out for school 