The wiki article says that i would need to take multiple pictures at different exposures and combine to get the detail right. Is that the only way?
No, it only says you need to do that when the DR within the scene exceeds your sensors abilities, that is not the case here, you are controlling the amount of light so you are controlling the DR.
I didn't really imply you should follow the zone system, I meant if you don't expose some of the black as grey it will all be a blob!
Here is the most important bit from the wiki "The key element in the scene is identified, and that element is placed on the desired zone; the other elements in the scene then fall where they may."
Now you are controlling the light, so you need to make sure the scene is contained within your cameras DR, if you decide that detail in the dark shadows is important (your key element) you need to expose so the very darkest areas of the scene are black, but that most of the black suit is grey Zone I and II, without blowing the highlights in the white shirt. Then adjust your blacks and shadows sliders in post to get the suit where you imagined it. If there is not enough contrast in the suit to separate the detail you need to use a levels curve control to spread out the tones in the suit.