§ The Sages taught yet another baraita: During the entire thirty-day period of mourning, it is prohibited to wear ironed garments, whether they are new garments or old garments taken out of the press, as ironed garments appear to be new. Rabbi Yehuda HaNasi disagrees and says: The Sages prohibited wearing only new garments. Rabbi Elazar, son of Rabbi Shimon, says: They prohibited wearing only new white garments. The Gemara relates that Abaye went out while he was in mourning in an old white garment, in accordance with the opinion of Rabbi Yehuda HaNasi. Rava, on the other hand, went out in a new, red Roman cloak, as he acted in accordance with the opinion of Rabbi Elazar, son of Rabbi Shimon.

Where do we learn that mourners are forbidden from washing themselves or annointing? Because the verse states: "Pretend you are in mourning; put on mourning clothes and don’t anoint yourself with oil; and act like a woman who has grieved a long time over a departed one" (II Samuel 14:2)...And just as a mourner is prohibited from washing her clothes, she is also prohibited from wearing new white and pressed garments.

(1) Joab son of Zeruiah could see that the king’s mind was on Absalom; (2) so Joab sent to Tekoa and brought a clever woman from there. He said to her, “Pretend you are in mourning; put on mourning clothes and don’t anoint yourself with oil; and act like a woman who has grieved a long time over a departed one. (3) Go to the king and say to him thus and thus.” And Joab told her what to say.

It is forbidden to wear during the seven [days of mourning] new dyed garments or old clothes coming out of the press:

Rama: Some say that it is forbidden to wear Sabbath garments during the first four weeks [of mourning], but subsequent to that it is permissible, even [for one who is in mourning] for his father or mother.So too, [is it permissible] to make new garments.- However, the common practice is to treat this [matter] as forbidden for the entire twelve months.

[During] the entire thirty days [the mourner] is forbidden to wear a pressed garment, provided it is white and new, and even if it is a flaxen [garment].

[One in mourning] for his father or mother is forbidden [to wear pressed garments] until the [first] Festival after the thirty days arrives and his friends rebuke him. For debarring himself from wearing pressed garments.