Breton stripes are great for any time of the year, but I think they really shine in the summer due to their coastal heritage. A lot of places carry the Breton stripe pattern as it is fairly popular. You can find them anywhere from Asos to J. Crew to APC and even Brooks Brothers. If authenticity is what you are looking for, then look no further than Saint James as they are the original makers of the Breton stripe shirt and continue to make it to this day.
Here I have made two pictures (one for guys and one for girls) to give you an idea on some cute, simple outfits you can put together with Breton stripes. For a summery look, guys should consider wearing a Breton striped shirt with some rolled up chinos and camp mocs. For you girls out there, consider wearing a Breton striped shirt with some shorts and espadrilles. Maybe even a choker to accessorize a bit.