Manchira (Under Armor) - Lightweight Flexible Auxiliary Chest

Samurai - Wikipedia

Men's UA Seamless Short Sleeve

Why did Samurai use considerably lighter armor than Knights? - Quora

Manchira (満智羅) - Japanese Auxiliary Armor

Men's UA Fast Left Chest T-Shirt

Manchira Kikko Gane Do - Guardians Vault Australia

Japanese armour - Wikipedia

Defeating Late Japanese Armor - Tosei Gusoku (当世具足)

Under Armour Tech 6 Boxerjock - 2 Pack, Academy//Mod Gray Light