Hit Points | From Armour
Different armours provide different bonuses, the charts down below will show you how many hit points you will have based on what type of armour you are wearing.
For it to count in one of these zones it needs to cover 50% of the area, which is the front and back of it as well. Otherwise, it is classed as one level less.
Imitation armour also counts as one level less as long as it covers 50% of that area or more.
Example: If you have a steel breastplate and it covers your front torso but not your back it would be counted as plate armour and give you 3HP as it covers 50% of your torso, otherwise it would be counted as medium armour and will only give you 2HP.
Hit Points | Bonuses
There are several ways that you can get extra hit points besides from armour and your class.
Periodic attire: if you are wearing clothes that are similar to styles from the 1800s or earlier you get a +1 to your HP.
Set Bonus: If you have a set of armour that covers at least 8 zones on your body and is all the same type, such as all chainmail or plate armour, you will get a +2 to your HP.
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Elective Armour: if you wear something that doesn't beneficially increase your HP, such as a gambeson underneath chainmail or sabaton's, you will get a +1 bonus to your HP.
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Musical Instruments: if you bring a musical instrument into battle and play it, you give a bonus HP of +1 to other members of your team, you can only benift from this once per round.
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Warband morale: if your warband brings their flag then you get a + 1 bonus to your HP as well as everyone else in your warband.
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Note: none of this can increase your HP over 20.