Ireland has never been particularly celebrated for its impact in fashion the same way that France or Italy has. However, it may surprise you that it has had more of an impact than most people are aware of.
We'll start with the classic Aran jumpers (pictured in lesson 7), which took off in the 1950's and 1960's. If your an American, your grandparents probably remembered them as 'Irish sweaters,' like my own grandmother did when I asked her about it. The beautiful knotted sweater is traditionally made with cream-colored yarn from sheep's wool. As a proud owner of an Aran sweater, I highly recommend purchasing one. It is extremely comfortable. Also, despite all the holes, it's excellent at keeping one warm without causing stuffiness.
Another classic of not only Ireland but of all Britain is tweed. Many adjectives can be used to describe this fabric: rough, woollen, flexible. It was traditionally used for shooting jackets by the nobility due to its durability and comfort.
One final Irish accessory that you've seen is the bucket hat (also known as a fisherman's hat). It was originally used to protect folk from the rain, but were quickly picked up internationally since they could be folded up and fit into a coat picket. They were also easy to clean. In fact, the design was so useful that the US Army issued a version (now known as the tropical hat) to its soldiers during the Vietnam War.
ere are many more traditional Irish clothing styles, and I encourage you to look them up. It's pretty easy to find stores that will sell all sorts of Aran sweaters and tweed.