al-Bukhari added in Adab al-Mufrad:

"He [the Prophet (ﷺ)] used to wear it on the visit of a delegation and on Fridays."

وَزَادَ اَلْبُخَارِيُّ فِي

اَلْأَدَبِ اَلْمُفْرَدِ

.‏ { وَكَانَ يَلْبَسُهَا لِلْوَفْدِ وَالْجُمُعَةِ } [1]‏ .‏