I never saw anyone more beautiful than the Messenger of Allah ﷺ with his hair combed down, wearing a red garment.
حدثنا أبو بكر بن أبي شيبة عن شريك بن عبد الله القاضي عن أبي إسحق
ما رأيت أجمل من رسول الله ﷺ مترجلا في حلة حمراء
Graded sahih. It is found in Musannaf, 8/177, 262. Sharik the judge was corroborated by Shubah, as reported by Bukhari, in the Book of Clothing, chapter on the red garment, no. 5848, and elsewhere, and by Muslim, no. 2337/91, and elsewhere.