Make your bed the French way with luxurious linens. Flat sheets only, so you'll need to perfect your hospital corners, but the sheets are plenty long to stay tucked in all around. Buy two and use one on the mattress, one as an American-style top sheet. A third one could even top your duvet.
These sheets are made of the softest pure washed linen. Keep them that way by promising to never iron them, just let them be their wonderfully rumpled, incredibly inviting selves.