I have ordered these pants on and off for the past several years.  At first, they were great, and held up well, though usually starting falling apart after about 6 - 8 months.  Note - before commenting on the quality of the product, I want to stipulate that I followed the manufacturers washing instructions to the letter!

At first I thought that being silk they were just more fragile than regular material.  They ARE extremely comfortable.  However, I started to notice that they were always coming apart at the seams, and the fabric would unravel making a sewing repair very difficult, if not impossible.

I decided to give them one more try, as they're really very soft and comfortable.  I ordered two more pair, and they began to fall apart even more rapidly than before (only lasted about six - eight weeks). Note - they always seem to last just long enough to preclude being able to return them for a refund.

My advice - they cost nearly $70 bucks a pair now, and they aren't worth $7. If you reall must have black, remember you were warned.

If you like other colors, you can find other brands which hold up VERY well.

I have a steel grey pair I bought from Wintersilks two years ago, for less money, and they are still in good shape.  I wear/wore the Wintersilks pairs just as frequently as this crap.