diamond armour showing up incorrectly 

Steps to Reproduce:

1. [Step 1] join a friends world 
2. [Step 2] get yourself some diamond armour
3. [Step 3] put it on

Observed Results:
armour surrounds entire player model when a full set is equipped and leggings are invisible 

Expected Results:
armour should show the players arms face and only cover the specific parts its supposed to (ie boots covering the feet not the legs as well)

Screenshots/Videos attached: [please attach an image or short video]

Notes: i have no resource packs applied in the screenshots and the problem does not occur in single player worlds