I'm not sure if this will help, but I have that exact fabric from Dharma for my Darth Maul build. Here's a photo against my Darth Vader gloves and sleeves as well as my Chippie boots (which are a bit worn). It's pretty black.
That having been said, the fabric in the above photo is folded over on itself several times, so no light gets through. When it is a single layer, the color will alter by what's behind it, so you'll want to line it with something black. There is a bit of color texture to it, when you are up close. Dharma will send a sample swatch to you. That's what I did, because I had already bought my linen for Darth Maul and I wanted to make sure that the raw silk was a good match.