It's a 'Bulk Load Carriage Harness, carrying, infantry, G.S.'.
Bulk Load Carriage: Harness
As you say, they got conveniently re-designated by militaria dealers at some point. I once managed to seriously cheese off a chap on the wwiireenacting forum when I pointed out that the 'Bren tripod harness' he was selling wasn't. The 'logic' of his riposte that I couldn't prove they had never been used to carry Bren tripods still makes me chuckle.
---------- Post added at 02:10 PM ---------- Previous post was at 02:04 PM ----------
Designed in Czechoslovakiaalong with the gun I believe. I remember thinking when I got mine one that it was so overdesigned it could be German
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