Hello,
I apologise for the late response to this and wish I'd seen this earlier. Thanks to those who recommended us!
Please do visit us if you still need skiwear for your 3-year old. We have everything from very warm thermals, gloves, etc. to outerwear - either one pieces or separate jackets and trousers. We sell new and second-hand skiwear so are very competitively priced.
Although it is of course important to ensure you have warm thermals and base layers, we think a warm jacket and trousers are also key, and they must be waterproof, not only water resistant.
If this is too late, we hope you had a lovely holiday and your daughter enjoyed her first ski trip!