Umar saw a silken cloak being sold in the market and he brought it to Allah’s Apostle (sallallähu alaihi wasallam) and said, “O Allah’s Apostle! Buy this cloak and adorn yourself with it on the ‘Id festivals and on meeting the delegations.”

Allah’s Apostle (sallallähu alaihi wasallam) replied, “This is the dress for the one who will have no share in the Hereafter (or, this is worn by one who will have no share in the Hereafter).

[Bukhari Book:52 No:289]