2) Isn’t it mentioned in the hadith that Rasulullah (sallallahu alaihi wa sallam) wore red clothes?
Answer:
If, however, the garment is plain red and has been dyed with anything other than safflower, then there is a difference of opinion among the Jurists regarding its permissibility for men. The preferred view is that it is makrooh tanzeehi (i.e. disliked and better to avoid, though not impermissible).
Wearing a red cap or a red turban on the head, however, is permissible without any karaaha (reprehensibility or dislike) according to all the Jurists.
The detail above is regarding plain red garments. If the garment is not plain red and has patterns of other colours as well, then wearing it is permissible without any karaaha.
(Imdaadul Ahkaam: 4/359,361 Maktaba Darul Ulum Karachi)
(Ahsanul Fataawa: 8/62, Saeed)
2) Yes, it does come in the hadith that the Prophet (sallallaahu alaihi wa sallam) wore a red garment (See: Sahih Bukhari, hadith 5848). However, scholars have mentioned that the red garment that the Prophet (sallallaahu alaihi wa sallam) wore was not plain red; instead, it had other colours as well. This is because the type of red garment that the Prophet (sallallaahu alaihi wa sallam) had worn (hulla) typically had red lines (khutut) along with lines of other colours.
( وكذا في فتح الباري: 13/377 ، العلمية )
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Mufti Faizal Riza