There are no specific colours that Jews wear while praying. While some people prefer to wear quiet and conservative colors other people will wear bright colours and patterns. It really comes down to personal taste.
Amongst the Chassidim, most men prefer to wear black.
Any color is permitted, but black is traditional.
white
There are no Jewish Christians.
For reasons of modesty it is preferable to wear another color. Red is seen in Jewish tradtion as a color that catches the (men's) eye.
Red.
White is the color for Easter Season
The normally wore robes which were black / brownin color.
Green if it is in Ordinary time, Purple if it is in Lent.
White vestments are worn
Roman Catholic AnswerMonks, nuns, sisters, and priest all wear the robe that is the color for their Order. For instance, Benedictines usually wear black, Cisterians wear white, Franciscans wear brown or grey depending on which branch they belong to, some may even wear black. Diocesan priests wear black. The only time they would wear a different color robe would be a priest - be they religious or diocesan - when they are celebrating Mass. Everyone would wear the same color everyday, but a priest would put on a white alb over his habit, and a chasuble for the color of the liturgical feast he was celebrating at Mass.
White.
White, or white and gold, is the color of vestments during the Christmas Season.
.Catholic AnswerThe robe the priest wears all year at Mass is called an alb and is white (the word alb comes from the Latin word for white). During Advent the priest wears a violet chasuble over this.
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.