Can anyone recommend any extremely thin sleeping bags? We have the 1 tog M&S bags but they feel like jersey. I have a sleeping bag I bought second-hand which is 1-layer cotton (I think, it feels stiffer, almost like linen) which is fantastic, but it doesn't have a label inside. DD gets warm at night and I'd really like another one of these, it feels cooler than the jersey-style bags. She's still moving around too much for a sheet. Does anyone know the type?