Here are my top picks for this age:
Waterproof jacket / ski jacket - PolaRN o pYRET
Casual jacket - Boden or Gap do some cool ones - these don't get much wear in our house so an optional item
Wellies - Tesco or Joules, plus welly socks from Joules
Gloves _ H&M multi pack of 3 pairs for about £2.99
Tights - Next or Boden, worth not buying el cheapo ones
Tshirts/tops - Primark/ Zara /H&M
Socks - M&S & Gap - get some funky knee highs
Cardigan - M&S
Fleece - Joules or Boden
Leggings,trackies, jeans - Gap
Skirts - Zara / Boden / Next
Walking boots - Mountain shop
Boots - independent shop for euro brands - Geox etc - but my dd doesn't seem to want boots any more which saves me £££
Scarf - let them make their own in thick wool garter stitch on big needles
PJs - PRimark cotton ones
Dressing gown - Boden mega fluffy one
The most important thing is to let them chose their own stuff or it won't get worn!
Stripes are popular in our house.