system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why do Tie Fighter Pilots wear respiration helmets?
gpt
In legends canon, it was because the TIE fighter lacked life support systems.

In current canon, TIE fighters have life support, but wearing a life support suit is still useful due to the chance of a hull breach, TIEs used by the Galactic Empire lacked shields, meaning a single impact could cause decompression. It also adds to uniformity, and helps promote the fact that Imperial troops and pilots were all a singular faceless cog in a machine, and not an individual.