SECOND HAND school uniforms

Geez - if you've chosen a school that still has uniforms in Belgium, there's no way you should be letting your kids go in anything second hand - school uniforms are a sort of status used to keep the school out of reach of the general gutter-scum.

Having said that, most schools seem to organise a 2nd hand clothes market for fund raising. See if your chosen establishment has one of those coming up.

No, uniform is really unusual here.

I can only think of 2 or 3 that do in Brussels and they are really quite small schools.

Very few private school s with uniforms eg isb and Bsb.

Most schools with uniforms are Catholic. Size is irrelevant. Near me a school of 1200 with uniform and another with 120.