What would age 13-14 be in adult sizes please?

[Shellfishblastard]

I am buying DD’s Halloween costume and need leggings in a specific colour.

She wears 13-14 leggings in M&S, and still fits into her Next age 13 leggings ok.

The only leggings I can find in the colour we need are for adults - what would the size equivalent be?

I appreciate they might be a bit long but that’s ok.

My 10 year old is 5 ft 2.5 she wears an age 15 in Next and I buy her a size 4-6 in ladies she is slim at 7 stone and a 6 can sometimes come up large on the waist.

Thanks all. I’ve gone for the 8

Could a 13 year old wear a size 10 dress

too big????