Here are some corselette and brassiere patterns from a 1953 volume of Zuschneiderkunst (Wächeschneiderei). It's my personal copy, so I probably can upload some more pages if the instructions aren't clear. There are also patterns for panties, slips, half slips robes, etc, as well as men's patterns, but those can be found in most pattern books of the period. Corset patterns are
rare
I'm still waiting for
Im Dienste der Frau to come back from deacidifiaction-- evidently a loong process It's got corsets, corselettes, girdles, brassieres, garter belts, details of manufacturing processes, and so on. It better not have been stolen

.
I do have a line on a Soviet corset book, but since I can't even read Cyrillic, the drafts, which approach the sophistication of engineering blueprints, are all but useless to me.