Since you are trying to a foot soldier from late 14th century, I'm sure you can get a short sleeved mail hauberk. Then you would want a brigandine and a bascinet with an aventail. Maybe not even a visor-less bascinet, but a sallet skull. Then hourglass gauntlets. Thats it as far as I know. Don't forget the most important parts are the under clothes and the gambeson.
If you are trying to portray a 13th century knight, you should know that the hauberk should come down to your knees, be long sleeved as well as have mail mittens/gloves and a coif. You also need a different kind of gambeson. The type of mail shirt for late 14th century, won't be as long as earlier hauberks, and should only come just past the elbows on the sleeves.
Your also talking about different sword styles. Maybe you could get away with a foot soldier using a late 13th century sword, or early 14th.
It also depends what you want to use the kits for, is the 13th century knight for a renfaire? then you can get away with just having the 14th century mail shirt, and a great helm. You could use that kind of shirt for a Man at Arms, or wealthy soldier as oppose to a knight. But then you should get a kettle or nasal helmet instead of a bucket helm.
