The Importance of Appearance.
A little etiquette is better than a lot of good actions. Many good manners with few good deeds are better than many good deeds with few good manners.
The Messenger of Allaah ﷺ said: “You are on your way to meet you brothers, put on nice clothing and fix you riding so you appear distinct among people as a fleck [on a beautiful face]. Allaah does not like roughness nor rough manners.”
The Messenger of Allaah ﷺ said: “No-one will enter Paradise if they have at heart a grain of arrogance.”
A man asked: “A man may like his clothes to be nice and his shoes nice.”
The Messenger of Allaah ﷺ answered: “Allaah is beautiful and loves beauty. Arrogance is to deny rights and look down at people.”
Dress properly, even among friends and relatives. Dress properly when visiting your parents, a pious person, an elder, or even a relative or a friend. Your attire should be clean and elegant, not ugly or unsightly.
if you were visited at home while dressed very casually, as it sometimes happens, you should change for your visitor. This will enhance his respect for you and will complement your hospitality.
A Muslim ought to be recognised by neat dress, cleanliness and graceful appearance.