What to put baby to bed in in warmer weather?

[Firsttimemummyworries]

Hi, just after some advice
our room is around 22 degrees atm with a window open. Doesn’t drop below 19/20 in the night - nearly 6mo baby has just started to roll over and sleep on her tummy (not sure if this can change how warm they get)
what should she be going to bed in?
I’ve put her in babygrow and 1 tog tonight but worried she might be chilly
Thank you

My son is 11months and in similar situation, just started sleeping on his tummy.
I've got him in a 1.5tog sleep bag and have popped in during the night to check on him and seemed fine. Checked the back of his neck and chest and felt nicely warm to the touch and also felt nicely cosy in the morning.
The midwife told me if his chest and toes felt cold in the morning, it might be best to add a vest.
We had him in the 2.5tog at the start of the warmer weather but the back if his neck felt moist and he was waking a lot.
There are guides online which suggest the tog type for room temp if that helps any? =)