I'm a bit lost on this one...
DD was born in November so it was easy, I just got 2 x 2.5 tog bags and we were sorted. By the time she needed a thinner bag we were ready for the next size and I just got one of each thickness.
I've still got 2 x 2.5 tog bags, but do I really need to get 2 x 1.0 tog and 2 x 0.5 tog bags? [stingy] Is there another combo I can get away with?