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This contains a very detailed diagram for drafting your own pattern for both the slip and the "cami-knickers" (what we would call a teddie). No instructions to assembly, but a seamstress with a fair amount of experience should be able to do it.
Free softie whale pattern from the Blog Small Dream Factory. Very generous lady -- and she has a number of other free patterns for children, too, including softies, hats, scarves, and mittens on strings (let's forget that Bill Cosby called them "idiot mittens!").