In scouts, the military and most outdoor books or schools teach the COLDER principal. It is a great acronym for caring and using you clothing.
C - keep your clothing CLEAN. Dirt can break down the fibers of your clothing.
O - don't OVERHEAT. Sweat can lessen the effectiveness of clothing.
L - wear you clothes LOOSE and in LAYERS. Makes your system versatile.
D - stay DRY.
E - EXAMINE your clothing. Look for worn or damaged areas of you clothing.
R - REPAIR any damage that is found.