Proper Fit / Proper Wear
-  Force of pulling the head through a collar
-  Belt tightening
-  Behaviour / Adaptation to size
-  Dimensions when extended
-  Perforation/bursting tests
-  Elastic recovery
-  Thermal behaviour
-  Breathability, etc.

Anti-bacteria

Sensory Analysis
-  Tactile
-  Olfactory
-  Visual, etc.