Board Thread:General Discussion/@comment-7292443-20130320015211/@comment-4057437-20130321073852

The standard Falmer Helmet from the base game is the one that works. You will have to enchant it yourself, so get several as the first enchantment increases your fortify enchanting potions which then allow making a better enchanted Falmer helmet, and so the loop goes.

As for fortify smithing potions, the best without exploits is 147%. You also will be able to make a  ring, chain, gloves and clothes with 29% fortify smithing as well.

Also, with Dragonborn, the Black Book: The Sallow Regent, there is the option to take the path Seeker of Might, which increases your skills in all the areas in the Path of Might, Smithing being one of them.