I got the red suit in size XL.  I believe that "sheer" is the best way to describe this product.  I've worn zentai suits before, but the fabric on this one is definitely more sheer than most.  You can definitely see out through the fabric on the hood very well.  However, this same ability to see well through the costume also translates to being able to see in.

While I was wearing the suit, I took photos of myself to see how I looked, and discovered that I could see - through the suit - my hairline, eyebrows, eyes, nipples, chest hair(!), navel, the manufacturer's tag, and printed details on the waistband of my underwear.

In an attempt to smooth out the appearance, I tried the suit on a second time with black tights and a black compression shirt underneath.  With that added, you could see exactly where the black garments ended, and it actually looked worse than the suit by itself.  You could read the brand labels of the tights and the shirt through the costume as well.

So in short: not pleased.  Going to try a different manufacturer's zentai.