There is a big auction on star suits from Robin's Star. I have a newborn one and they are soooooo useful. Warm without being too thick so I was quite happy using it with a car seat. They are roomy too so good for layers underneath.
Thought it might be of use to someone. They are cheaper than pramsuits that you see about. Link below
www.facebook.com/#!/media/set/?set=a.763177990396066.1073741877.165859846794553&type=1