They were, as long as you get rid of the bascinets. Bascinets were only present in that form during the mid to late 14th c. in the case of the clappvisor, or the early 14th c. to early 15th c. in the case of the hounskull and the visorless. The kettle hats were arguably around until WWI.
Edit: I'm actually making my own private 15th century mod reworking all the western kingdoms and troops (I'm using some resources from other mods, otherwise I'd release it) and these armors blend quite seamlessly with the other higher quality 15th century armors and weapons available. They complement the feel of the era very well. The only problem is that the body and leg armor of any troops must consist only of armor from this pack due to of the unconventional leg layout. Right now, I think that there's enough variety to pull that off successfully, but even more armor of a similar type would always be welcome.