American X-Small Size

[anaxcrosswords]

My daughter wants a particular t-shirt from a US site, but it appears to be available only in X-Small.
Anyone know what this would correspond to in UK sizes?

[boxtops]

I don't know if this might help http://www.fashion-411.com/Size_Conversions.htm

I find it does depend on where the garment is made, too. I bought a bodywarmer made in China - the size which fitted me was XXXL!

[Robinia]

Mot websites seem to agree x-small is a UK size 4 which is really tiny.