Stressed about sleeping bags

Elsie
Hi girls just wondering who's got their baby in a sleeping bag at night? What is your baby wearing at what temp? 
My little girl is in a 2.5tog bag and the room temp is between 16 and 18. I know this means she should just be in a long sleeved vest or sleepsuit then the bag but my little one feels cold like this. Anyone the same? She arms and face/head feel cold but I'm terrified of over heating. She's been a fussy sleeper I I kept thinking it was because she's cold. Tonight I've tried having an extra vest underneath and she's slept more peacefully but when I picked her up her back felt warm she still feels cold on the front.
What are you guys doing?