There are two types of clothes: Uniforms and Kevlar Suits.

Uniforms and kevlar suits have set durability/expiration, when it's up they are not valid anymore due to leakage issues. Therefore, oxygen tank consumption becomes faster, and settlers have to refill their tanks more often when their clothing durability hits zero.

Uniforms are valid for 30 days.
Kevlar Suits are valid for 50 days.

Each day brings extra points to the settler's confidence depending on the clothes type.
* Uniform [+1]
* Kevlar Suit [+2]

When the clothing durability hits zero, the settler gets [-1] point.