Marucs specializes in reproduction fabrics. Judie Rothermel designs the Centennial Solids line for Marcus; I don't know if they make a white, but there is sure to be a cream. They also have a line of aged muslins.
https://www.fatquartershop.com/nsear...tennial+solids
https://www.fatquartershop.com/nsearch/?q=muslin+marcus