To begin with there are many different types of ponytails that can be made from thin hair. French fishtail is one of them. It goes very well with thin straight hair. The quality of hair should be improved using a good shampoo and conditioner prior to making this hairstyle. It will suit especially those people who have straight long hair and will look very stylish on medium sized hair. French ponytail cannot be made in short sized hair so make sure you have a good length to make this hairstyle.
Divide your hair into two sections starting from the top towards downside right in the middle. Use a tail comb to do that. It will give a sharp look. Make a tight French braid out of it by pulling the right section of hair over and above the left section. Then take a strand from the right side and pull it over the left. Keep doing this till a fishtail braid is made. Use your fingures to loosen the tight fishtail braid if you feel it is a bit too tight. Use a hair band with elastic to tie the hair at the bottom of the fish tail. It will give a fine look then.