This armor is widely used as it surpasses the Samurai Platemail by 2 speed. However, you have to be a level 18.

After some people reach level 20 they start using the Hefty Coat for more defense, but people will still use this for traveling far places, that is until they obtain a Desert Shroud which adds 11 more defense or Travelling Salesman which surpasses the Rogue's Plate in both stats.