Shirts have been around since before the middle ages, having originated as under garments and night gowns. In the earlier days these shirts were generally very simple, home made garments that were just pulled over the head, without buttoned openings.
The better off however, would have their shirts tailor made. Like all menswear, the design of the shirt changed only very slowly over the years.
The modern day shirt began really with the button front shirt, first registered by Brown,Davies & Co. in 1871. In the 1930`s the fixed collar shirt gained in popularity and has remained popular ever since.