Children's clothes- where to buy simple, smart stuff?

[CoverYourselfInChocolateGlory]

DD sings in a choir, and they need to wear plain navy or black clothes to perform and she'd like something a bit smart. She is also in a theatre group where they need black leggings and t-shirts.

I'm just about managing to find the casual stuff for theatre, but where on earth can I find single colour blouses that she wear to choir? She really doesn't want to wear her school uniform and it has the logo on it anyway, which the choir doesn't like.

I've tried the supermarkets, Next, M&S, John Lewis, La Redoute, Boden, Monsoon, New Look, Benetton. Don't want to head to Trotters where a t-shirt costs £50, thank you!

Any tips? She's 8, but wearing size 9-10.

M&S?

www.marksandspencer.com/unisex-long-sleeve-polo-shirt/p/clp22522046?extid=ps_ps-gpla_ggl_kw_ch__-UK---&ds_rl=1296067&ds_rl=1295956&ds_rl=1296067&ds_rl=1295956&gclid=CjwKCAjwxZqSBhAHEiwASr9n9PWZZYPzcz7wbaAPAfO8Fa97jW_zhZovLBS5j860lJCPwSAP3luQ5xoCz_4QAvD_BwE&gclsrc=aw.ds

Zara

river island

h and m