Uniqlo Heatech Leggings and Tops - sizing

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Uniqlo have some of their Heatech on sale but mainly in XSmall which they put as a UK 4-6

But what size does it fit up to IRL?

(My DD is a 6-8 and she needs ski clothes for a school trip next year. I thought if I stocked up on some sales stuff then I won't be running around like a headless chicken next year)

Or I can do Ebay searches.

TIA

I am a small size 10, and I "fit" size S, but I prefer M as it's a bit longer.

I find them quite true to size. I'm an 8-10 and I have small tops which fit well.

I am a 14 top and take a medium. Their sizing is extremely generous.

The leggings are awful.
Worst ones I've ever bought.
The top is nice and cosy though.
I'm a 12 and I wear a medium.

I'm 8-10 and wear a small because I don't like things too tight, could probably fit a XS

I also think their sizing is generous. I am a 10 and have a couple of xs uniqlo items

it's the layers I was looking for (to go under her....whatever you wear for skin-ing )

If I buy them in the sales now, they're about half price, even though the colours are a tad lairey.

She should be fine with a Small (because I know she'll grow by then )

skin-ing ? SKI -ing

uniqlo have a sale?!

off to check that out