We go off the Grobag Nursery temp gauge and dress Amy accordingly. We use a 0.5 tog Grobag and long sleeved bodysuit (no legs) if it is 21 and a short sleeved Grobag if it is 24. It hasn't been hotter than that yet so I'm not sure what we will do. For naps if it is warm we just put her in the cot with no Grobag and just a light bodysuit. The 1.0 tog seems warmer than one of the 2.5 togs that we have and the 1.0 does seem warm. If it's 18 we use a long sleeve body suit and 1.0 tog. We don't put any pants on with the Grobags as she gets too hot.