Invisibility effect don't affect the second layer skins of stray and llama.
Llama only the chest invisible.
Environment
OS: Windows 10 64-bit
Java 8 version: 1.8.0_111-b14 64-bit
CPU: Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz
GPU: NVIDIA GeForce GTX 650
Drivers: GeForce 375.95
RAM: 24GB
Linked issues
relates to 4
MC-61
endermen, spiders and cave spiders eyes and sheep wool remain visible when invisibility potion has been thrown on them
Resolved
MC-140969
Villager/zombie villager clothes remain visible when villager is invisible
Resolved
MC-88791
Coat of invisible sheep is invisible
Resolved
MC-93884
Shulker with invisibility effect has head visible
Resolved
This issue relates to MC-88791 / MC-93884 / MC-61.