I'm another one for the Quilt Police!! They are going to have such a busy week!!!
I use sheets ALL THE TIME!! Sorry but its the only way I can afford to do it!
I do buy 110 inch wide sheeting from a very nice man on the market in Leeds when I am in the UK and that needs prewashing as its sometimes a bit grubby here and there - but at £1 a metre I don't care!!! AND he has it in loads and loads of different colours!
I pre wash new sheets out of packets too - to remove dressing and creases. :)