Underwear... underwhere?

[Snowcat]

Hey all,

If I could trouble the doyen's with a clothing question: where have people found a good place to buy small (I guess xxs or smaller) underpants?

Safira is barely 50cm around the waist and whilst it is easy enough to procure "girls" knickers that fit - they are just basic knickers and, understandably, not especially... tantalising shall we say.

I love the look of lace, French knickers and am partial to a thong but I'm coming up empty. Any ideas?

Thanks in advance