إِنَّ اللَّهَ جَمِيلٌ يُحِبُّ الْجَمَالَIndeed, Allah is beautiful and He loves beauty.[Sahih Muslim, Book 1, Number 0164]
Our faith in Allah’s beauty should also encourage us to concern ourselves with our appearance, dress, and decorum, as well as with the beauty of our words and deeds. This is something that Allah wants from us. Someone once approached the Prophet (pbuh) and asked, “What if someone likes that his clothing and his shoes are beautiful?” The Prophet (pbuh) replied:
Some more on this subject: (from other various sources)
A Muslim takes good care of his clothes, so you will see him presenting a pleasant appearance, without being extravagant. He is pleasant to look at and to meet, and does not annoy people with his careless, disheveled appearance. He always checks himself before he goes out to meet people, and he makes himself look good, in moderation, for the Prophet (s.a.w.s.) used to make himself look good in front of his Companions, as well as in front of his family.
The Prophet (pbuh) who was the epitome of asceticism and humility, used to dress in decent clothes and present a pleasant appearance to his family and his companions. He regarded dressing well and looking good as a demonstration of the blessings of Allah.
“Those who, when they spend, are not extravagant and not niggardly, but hold a just “balance” between those “extremes”.” (Qur’an 25:67)
The Prophet (pbuh) would immediately warn any of his companions who were unkempt or failed to care for their appearance.
"I saw the Messenger of Allah (pbuh) ask for a new garment. He put it on, and when it reached his knees he said, 'Praise be to Allah, Who has given me clothes with which to cover myself and make myself look beautiful in this life.'" -Sayyidina Umar (RA)