Armored Monk (3.5e Feat)
From D&D Wiki
Armored Monk [Martial Style]
You have been initiated into the ancient prancing crab style, which trains acrobatic maneuvers while armored.
Benefit: You can use all monk class features even while wearing light armor. Yet, if you do so, your monk bonus speed and your Wisdom bonus to AC are halved.
Normal: When wearing armor, a monk loses her AC bonus, as well as her fast movement and flurry of blows abilities.
Special: You can take this feat as a monk bonus feat at 1st, 2nd or 6th level. You do not need to fulfill the prerequisites to take it as a bonus feat, but note that this would mean suffering armor check penalty to attacks.