Histories 2.81

1 They wear linen tunics with fringes hanging about the legs, called “calasiris,” and loose white woolen mantles over these. But nothing woolen is brought into temples, or buried with them: that is impious.

2 They agree in this with practices called Orphic and Bacchic, but in fact Egyptian and Pythagorean: for it is impious, too, for one partaking of these rites to be buried in woolen wrappings. There is a sacred legend about this.