The sleepwear can be important, but it's how it's removed and who does the removing that moves the sensuality quotient WAY up the charts.
And I have found that picking the right sheets helps a lot. In summer, our sheets are made of a soft cotton, like T-shirt material. In the winter, we go with flannel.
And this isn't me, ya know, but a friend tells me that absolutely the most sensual pose his beloved wife has ever taken is when she has wrapped the sheet around her to cover her from cleavage to mid-thigh, so that neither primary nor secondary sexual characteristics are showing. Then he reads to her, and she nestles her head on his shoulder, and places her soft and gentle hand on his chest, and plays with his chest hairs. When his mouth goes dry, he knows it's time to put the book down and cuddle.
This is all hearsay, you understand; perhaps it's not really true.
Greetings from Woodstock, GA, cultural center of the universe.