I was nervous about this dress, too -- polyster, and a juniors dress?  But most dresses with a style this classy run about $80-100, so I had to try.

I'm 5'5" and a trim 120 lb, and wear a 0 in most clothing stores (Banana Republic, Express, etc.), but I was wise and ordered a 5/6 in this dress.  It's perfect for a summer work dress -- cap sleeves, hits right above/at my knee, and I love the peplum detail.

I was right about the fabric -- it's pretty cheap and you have to be careful not to set the iron too hot.  But it's black, and I don't think anyone will really notice unless they are touchy-feely.

I've been wearing it for 2 hours and have already gotten several compliments!  Go for it and pair it with your favorite colored pumps.

Update later in day: the belt broke by 10 pm!  I didn't do anything strenuous, it wasn't buckled tight..just...fell off, broken!  Be prepared to provide your own belt.