American Apparel was a clothing manufacturer based in Los Angeles, California. It was founded in 1989 by Dov Charney, and it became known for its trendy, casual clothing such as T-shirts, socks, and legwear.
The logo for American Apparel uses the font, Helvetica Black, with narrow spacing. Helvetica is a neo-grotesque style typeface, influenced by Akzidenz-Grotesk, the famous typeface from the 19th century. The font is a commercial one and you can purchase it here.