Use potion to hide yourself AND nametag (0.4.15+ only) for 3 minutes.
Server admin can use the '/vanish <name>' command to hide/unhide players or themselves by leaving it blank, and Yes... I am in the picture below :)

Depends: default, vessels
Source: https://notabug.org/TenPlus1/invisibility
Download: https://notabug.org/TenPlus1/invisibility/archive/master.zip
License: MIT