Sentence:  The guides point out to you a magnificent suit of equestrian armor,[...] Near it are two male figures of the youths, Henry and Charles, sons of  Charles I, both clad in the <WSD>armorial</WSD> suits worn by these lads. The suits of armor worn by the figures generally, are not those of the persons whose names they bear, and serve but to indicate the style of the armour used in different periods. 
Meaning of the word marked with <WSD> tags:  In, or pertaining to, armor.