I don't have girls, but this is a list I use to keep track of the boys stuff:
White linen shirt
Beige linen trousers that can be rolled up
Brown smart sandals
1 other summer short sleeve shirt
Australian type sunhat
2 pairs shorts
2 pairs zip off cargo trousers
Utility sandals
Towelling sweatshirt
Lined cagoule
4 plain white t shirts
2 coloured/ patterned t shirts
1 motif t shirt (eg Star Wars) to wear to friends parties
Velcro pumps
2 rash vests
2 swimming trunks
2 beach shorts
Crocs
Swimming pool sunhat
Navy chino type trousers
Chambray type shirt
Smart jumper
Brown/navy winter shoe/ boot
Rugby shirt
2 pairs jersey lined utility trousers
4 long sleeve t shirts
2 pairs jersey track pants/ joggers
Walking boots
Wellies
Waterproof over trousers
Lightweight zip up fleece
Sherpa fleece
Winter coat
Winter hat
Thick waterproof gloves
Woolen gloves
5 pairs normal socks
7 pairs pants
3 pairs summer pajamas
3 pairs winter pajamas
Cubs utility trousers
Cubs sweatshirt
Cubs t shirt and necker
Sweatshirt
Football kit
Football socks
Football boots
1 pair quick drying nasty shell type joggers
Sports trainers5 pairs sports socks
3 pairs school trousers
1 pair school shorts
2 school jumpers
1 pair knee high school socks
4 pairs school socks
1 school shirt and tie
3 school polo shirts
School sports shorts
Swimming bag and towel
School pumps
School shoes