Priests: Garments of Worn Always While Engaged in the Service of the Tabernacle
Source: TTT
Exodus 28:43
Aaron and his sons must wear them whenever they enter the Tent of Meeting or approach the altar to minister in the Holy Place, so that they will not incur guilt and die. This is to be a permanent statute for Aaron and his descendants.
Exodus 39:41
and the woven garments for ministering in the sanctuary, both the holy garments for Aaron the priest and the garments for his sons to serve as priests.