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Jedi are known for wearing robes with hoods, and though it looks cool, I am pretty sure it doesn't provide any protection to blaster bolts.
Now I know the Jedi can deflect blaster bolts with their lightsabres, and all of Obi-Wan's 'uncivilized' thing but I am pretty sure armour would have been efficient during Order 66 when they were surrounded by many hostiles.
So, why do they not wear Beskar armour or something?
Nobody wears armour unless they are expecting to fight. In our world soldiers didn't generally put on armour unless they were going to battle. Armour is uncomfortable. You don't wear it unless you need it.
Additionally armour makes it look like you are coming for a fight. If you show up for a peace negotiation, or a diplomatic visit, or a garden party wearing armour it is sending a message that you are expecting a battle. That can make the meeting/negotiation/party go much worse than it otherwise might, and put you in more danger than you would be without it (as well as not achieving your objective).
Armour restricts your movement. Jedi rely on their speed and dexterity to protect themselves, and armour might make that more difficult.
In short even if there might be some small combat benefits to Jedi wearing armour there are good reasons not to.
Why didn't the Jedi wear armour?
Well, Obi Wan did wear armor during the Clone Wars. But as you stated, neither he nor any of the other Jedi needed it.
I am pretty sure armour would have been efficient during Order 66 when they were surrounded by many hostiles.
Considering that the Jedi were caught completely off guard and were heavily outnumbered, having armor probably would not have helped much. Maybe a few more would have survived, but most would likely have still been killed.
Keep in mind that the Clone Troopers and Storm Troopers all wore armor and were still able to (sometimes easily) be killed by blaster fire. So, the commonly available armor didn't seem to offer that much protection against blaster fire. And Beskar being difficult to acquire, is probably why it was rare to see anyone using it as armor.
