Harlock had that room set up special so the air vents and lights would create an impressive silhouette-with-cape-blowing-in-the-wind effect. It's how he seduces all his beautiful paper ladies.
No matter where Harlock goes, there's always a gust of wind nearby willing to help him out. To wind, blowing through that cape is like a kind of wind orgasm.
This dub is pure awesomeness. I haven't seen it in years, but I remember one scene where a figure teleports onto the bridge of the ship and one of the peons yells, "Captain! There's a person on the bridge!" and Harlock replies, "That's not a person, IT'S A WOMAN!"