In this picture Jennifer Aniston is wearing one of her sleek black suits with her hair up in a ponytail. I like the contrast between the tailored and chic black suit and her hair loosely pulled back in a ponytail with a couple of pieces hanging down in front.
To accessorize the pony, you could add a Di Manno Designs black leather or black patent leather ponytail holder with this look.
If you want a little more detail or color in the back you could add a Di Manno Designs black croc , python or red patent leather ponytail holder with this look.
To keep the look sleek, you could use a ponytail holder in narrow size. If you are looking to add a little edge, be bold and go with the standard size!