Do you mean sewing or knitting? I've just had a look in my inherited pile of knitting patterns from Mother, who's given up, and there is a pattern book, Jarol 614, which has patterns for that size of doll ("larger sizes are also suitable for premature babies"). For boy dolls there are vest and pants; leggings & coat; romper & pixie hood; dungarees & sweater; beach suit.
If you're interested, PM me and I can supply images.