lol..i dont know what temperatures you've bn having down there, but if they are anything like up how, then how ridiculous of her.
I used woollen singlets for both of my babies, but then one was a winter baby and the other one struck a particularly cold october, and he def didnt wear them once summer kicked in.
woollen singlets..are basically just singlets made out of wool. I had a mix of ones that my aunts knitted for me, and store brought ones.
farmers and baby factory both sell them (as im sure other outfitters like babycity etc do too). they do last for aaaages and they are fantastic but they arent cheap..i think usually about $20 each for just a basic one. failing being able to find those there is a merino range of undergarments at farmers..and an online place too(i know advertised in the back of the childrens/baby magazines)
here is a link to a baby factory one
http://www.babyfactory.co.nz/products/group/50/page/1/style/78900/#thats only 80% wool...you can get 100%, they are usually kind of an off whitey colour (no white like in the pic) tho i guess you must be able to get white too lol
and ditto to Bekkaz, i never put the woollen singlet straight against the skin..i always stuck a little cotton one underneath..just bcos wool makes me itch so i figure it prob makes babys itch too lol