Track Suit (Russia)

[Cammagno]

When equipped it counts as summer.
What does it means?
A) The player that equips it is considered in Summer, while the other players are in the season set by the current Season card? [my favorite]
B) All the players are considerer in Summer, regardless of the current Season cards?
C) anything else? (such as: the player wearing it / all the players are both in Summer than in the season set by the current Season card)
D) I got it completely wrong