DressLink is not a scam, it's a real site with real products that has become increasingly popular. It doesn't have the best quality of clothing but at prices normally under $7 and sometimes as low as $.01, it's hard to be too unhappy with what you're receiving. Many of the products tend to be knock-off versions of popular brands and trends. Keep in mind that sizes tend to run much smaller than normal U.S. sizes and that shipping is very slow because the items are coming from China.
Items are very, very cheap so you can frequently find incredible deals on major brand look-a-likes. If you like always wearing new things and don't mind the inconsistent quality then DressLink is a recommended site to buy from.
As mentioned in the summary, finding the correct size can be challenging because these aren't your standard U.S. sizes. Also, returns are challenging because the items are shipped from overseas. Make sure to look at item reviews before buying to avoid any issues around product quality and sizes.