My little girl is 2 and a bit and although still in nappies we are putting her on the potty each time she has her nappy done and most times she does something. Cos its cold she wears vests under her clothes so I wanted to get her vests that don't popper up now but I looked in asda and they don't seem as warm. Is that right? Cos that's why I want her to wear them to keep her warm! And the thermal ones were really expensive at £6 for 2!