Kuras secured victory in one hour 29 minutes and 55 seconds in Apia, 15 seconds ahead of Solomon Islands' Dianah Matekali - who was wearing shoes.
After the race, the 20-year-old champion told the Pacific Games News Service: “Yes, I won it with only socks on.
“Wearing socks is a personal decision that I made because I had never run with shoes on before, so I didn’t feel comfortable running in shoes at these Games.
"When I tried the shoes on, my feet felt too heavy and I didn’t like it.”