Before using any of these, you should ask for persmission from the respective artist or company:

https://data.openfrag.org/Akiman/knight-full6.jpg
https://mccullochs.on.ca/acatalog/Fd34100.jpg
https://www.herr-der-ringe-film.de/v2...nematrix11.jpg
https://img-nex.theonering.net/images...syt_poster.jpg
https://www.baalzamon.net/Equipment/I...te%20Armor.jpg
https://jpscoffee.com/v-web/gallery/a...London-Getaway!/Suit_of_Armor.sized.jpg (i like this pic)
https://www.swordsandarmor.com/mediev...-of-armor.html (four suits)
https://www.armory.net/Armor_Header.c...nId=armor_Suit
https://members.aol.com/yavashred/diagram.jpg (front and back view)
https://www.freehomepages.com/moe24601/Models/armor1.jpg
https://www.wired.com/wired/archive/1...F.gaming.2.jpg

I don't know what keywords you used, but when google try different variations and be willing to scroll through a few pages of images. Some the keywords I used; plate mail, medieval, knights, armor, reference, drawing.