Normally, priests do not wear a mitre, only a bishop does.
In the Eastern Catholic Churches there are mitred archpriests or chorbishops who are ordained priests that are entitled to wear a mitre.
Because he is a bishop.
alb
White vestments are worn
Off-white is NOT a liturgical color approved by the Catholic Church.
A priest's vestment is generally white when it's Easter. On special occasions, however, a priest might wear gold in white's place.
It is an outer vestment worn by a priest.
A priest's vestment is simply known as a gown or robe.
During Baptism the color of priest vestment is WHITE.
.Catholic AnswerThe only vestment that I have ever seen a priest wear would be an alb, some religious priests wear an alb with a hood attached to it, although this is hardly normal or required.
Saint Patrick's Day falls during Lent so the vestment color would be violet.
alb
There is no prescribed hat that saints wear. A bishop may be shown wearing a mitre, a priest a birreta, a nun may wear a veil.
Roman Catholic AnswerThe only one who would normally wear a crucifix over a vestment would be a Bishop, who would wear a crucifix and carry a crozier.