Black onesies are almost impossible to find! We had a baby shower for a gal at work and we call her our Goth Girl because she always wears black so I knew I had to find some black onesies but it took some serious looking! I finally found them at Zoey's Boutique and they are great! You never know what you'll get when ordering online so I was very pleased with the great quality of the fabric. They're 100% cotton and thick like a nice t-shirt, not paper thin like some brands of onesies/bodysuits out there. And the customer service was great so I highly recommend them!
The above picture was taken at the shower. Onesies on a clothesline is my standard shower decoration, but really, who doesn't smile just looking at baby clothes. They're so little they just can't help but be cute!