Also beware of rolls of thread with RZM labels.
Please post this tunic in a separate thread. Neither the tag in the lange Hose nor the Verwaltungsamt SS stamp are authentic in my opinion. I cannot fully tell with the textile, itself. No site has more images of authentic black SS regalia than here, but this item should be moved to a place for separate analysis. The only sure way to tell with these items is to examine them in person, as these images are not as revealing as they could be.
This thread is for authentic RZM and SS tags of various kinds and should not be degraded to an "is it fake...?" thread like all the others.
Adrian is also right that "SS thread" bulks danger and disappointment with it.