"Sholop was experimenting with a new crafting material. He made some hats, but they were not as strong as he wanted. I thought they looked nice, so I bought the entire batch to give to my best customers. You can have one."
The light green hat is a mostly cosmetic piece of headwear, with 2 defense. It was the 10-day membership reward from February 27th, 2015, to July 17, 2015 (Aberoth's Steam release). Unlike other membership rewards, it was available even to accounts with expired memberships.
Players will buy and sell light green hats for large amounts of gold due to their rarity. The prices has steadily increased from since the Steam release in 2015, since many players who owned them are now inactive and their supply is limited.
Leather Cap · 
Light Green Hat · 
Iron Helmet · 
Festive Hat · 
Horned Helmet · 
Casting Hat · 
Conjuring Hat
Sash · 
Large Sash · 
Alchemist's Belt · 
Traveler's Belt · 
Casting Sash · 
Sash of Divination
Leather Shoe · 
Leather Boot · 
Iron Boot · 
Boot of Agility