What is the difference between casual and comfortable? Jeans are casual but are they always the most comfortable? Not wearing a tie is considered casual but if everyone else is wearing a tie, how comfortable will you be in that setting? Wearing revealing clothing in the workplace can be terribly uncomfortable. Going to a formal event in a pants and top may be comfortable insofar as ease with which to move but I doubt you would be comfortable in casual clothing in that setting.
As with all debatable points, we need a definition.
Physical Comfort: no binding or tightness around the waist, chest, thighs, really anywhere on the body; ease of movement
Psychological Comfort: appropriate dress for the occasion
Emotional Comfort: relaxed and happy with what you are wearing
Social Comfort: feeling good no matter who you are with; not feeling self-conscious
Economic Comfort: directly related to occupation and profession combining appropriate dress for the occasion, place and people
|Source: Izquotes. Retrieved Wednesday, Feb. 18, 2014|
Comfort is in the sensory perception of the wearer.