Idk how to make slippers or beanies but it's simple!
use the jacket as the base and cut off the sleevs, so you have a cool zip-up collar thingy
cut off the legs of the pj suit (that's what i did) so you can get a loose sleeve and then sew it onto the jacket
also take the back of the pj suit and cut out a trapazoid for the pockets, and also if it has ears, cut that off too
take a hoodie and cut off the hood!
sew everything together and tada!