Tier 1
Practically new, likely never worn outside, just left alone and admired. Recent gear (within the last 5 years), most likely has tags, but is branded/logo-ed.
Tier 2
Light outdoor use, only worn a few times. Recent gear (within the last 5 years), with very light wear.
Tier 3
Substantial outdoor use, probably about a season, and clear evidence that someone has loved this gear. Worn enough to be undoubtedly "second-hand."