There is no set color for a First Holy Communion Mass (although gold can substitute for any color), so he would wear whatever the color of the season is, green for Ordinary Time, Violet for Advent and Lent, White for Christmas and Easter. It would be different if the first Holy Communion was on a saint's day. He may also just wear white or gold.
Obviously it is white because it is a symbol of purity and innocence of the child.
White suit, white tie, white shoes is traditional. However, any color suit of your choice is now appropriate
WHITE
Green
is there a significance in rose vestments on laudate sunday
The priest wears red vestments on Palm Sunday.
White vestments are worn
baccalaureate masses during lent season
The color of the vestments of the pope, or any priest or bishop, depends on the liturgical season. During Lent or Advent the vestments are violet.
White, or white and gold, is the color of vestments during the Christmas Season.
Either blue or red depending on what story you are talking about
He wears red vestments when presiding over Good Friday services.
Often, a banner matching priest vestment color is in front of altar, the color being associated with the church time, like purple as it is in Lent. It does not always match; if priest is doing funeral he will wear white but the altar may still be purple.
Roman Catholic AnswerWhite is the color for the Solemnity of Christ the King. Gold or Silver may be substituted.
The normal color of vestments during Advent is violet. However, on the Feast of the Immaculate Conception (December 8) white and blue vestments may be worn in honor of the Virgin Mary.
Red vestments are worn on Passion (Palm) Sunday.