Covers for Moses basket/carrycot

[HoneyMum21]

DC1 is due in December and I'm just wondering what sort of sheets/blankets/covers I should be getting for when he's in his Moses basket and for when he's in the carrycot of his pram and we're out and about? Should I just be using plain flat sheets to cover him then blankets as needed or are there special sheets for covering him over (I.e different to the flat sheets you'd pit underneath)

Thanks

I used pillowcases for the mattress when my proper sheets were dirty. I wrapped the baby in layers- cotton sheet, cellular blanket.