Short answer
Any clean, modest outfit that keeps the men's rules: no gold jewellery, no pure silk, and nothing copied from women or from another religion's rites. Gold or silk embroidery up to four fingers wide is allowed in the Hanafi school. A sherwani, thobe, suit or turban are all fine.
The rules of men's dress apply on the wedding day too. A man may not wear gold rings, chains or watches, or a garment of pure silk; bands or trim of silk or gold thread up to four fingers wide are permitted. Customs such as the sehra (flower veil) are discouraged by Deobandi muftis as borrowed from Hindu wedding rites.
The four schools agree on this.
Explanation
The Prophet ﷺ held up silk and gold and said both were forbidden to the men of his community. Umar reported that he forbade men to wear silk except for a strip of two, three or four fingers. The Hanafi scholars apply the same four-finger allowance to gold thread woven into clothing, so a groom's outfit can have borders or bands of zari work, but not a garment covered in it.
- Clothes: a sherwani, achkan, jubba, thobe with a bisht, or a suit are all fine. A garment of pure silk is not; blends follow the rule in is silk haram for men.
- Embroidery: gold or silk thread in bands up to four fingers wide is allowed. Gold-coloured thread that contains no gold is not gold.
- Jewellery: no gold ring, chain or watch; see is gold haram for men and wedding rings. One silver ring is fine.
- Head: a turban or cap is a lovely choice.
Customs. Many Deobandi muftis advise against the sehra, a veil of flowers over the groom's face, and heavy garlands, because they come from Hindu wedding ceremonies. Henna on a man's hands for decoration is also discouraged; see can men put henna on their hands.
Sunnah touches. Bathe, use perfume and wear your best clean clothes. White is a colour the Prophet ﷺ praised. For the nikah itself, see the nikah guide.
The evidence
Quran, Surah Al-A'raaf 7:32
قُلْ مَنْ حَرَّمَ زِينَةَ ٱللَّهِ ٱلَّتِىٓ أَخْرَجَ لِعِبَادِهِۦ وَٱلطَّيِّبَٰتِ مِنَ ٱلرِّزْقِ ۚ قُلْ هِىَ لِلَّذِينَ ءَامَنُوا۟ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا خَالِصَةًۭ يَوْمَ ٱلْقِيَٰمَةِ ۗ كَذَٰلِكَ نُفَصِّلُ ٱلْءَايَٰتِ لِقَوْمٍۢ يَعْلَمُونَ ﴿٣٢﴾
Say, "Who has forbidden the adornment of Allah which He has produced for His servants and the good [lawful] things of provision?" Say, "They are for those who believe during the worldly life [but] exclusively for them on the Day of Resurrection." Thus do We detail the verses for a people who know.
Adornment and good things are lawful unless Allah has forbidden them.
Sunan Abi Dawud 4057
Graded sahih... إن هذين حرام على ذكور أمتي ...
"These two are forbidden to the males of my community."
Said while holding silk in one hand and gold in the other.
Sahih Muslim 2069
Sahih... نهى نبي الله صلى الله عليه وسلم عن لبس الحرير إلا موضع إصبعين أو ثلاث أو أربع ...
"The Prophet of Allah forbade wearing silk except for the space of two, three or four fingers."
The source of the four-finger allowance for trims and embroidery.
Where the ruling is recorded
- al-Durr al-Mukhtar with Radd al-Muhtar, Kitab al-Hazr wa al-Ibaha, section on clothing. Silk bands up to four fingers are allowed, and the same measure for cloth woven with gold.
- al-Hidaya, Kitab al-Karahiyya, section on clothing. Gold and silk are forbidden to men, with the allowance for small trims.
Checked by our team. For a more accurate answer to your own situation, consult a scholar. Quran translation by Sahih International. Hadith Arabic from the standard editions of the six books and the Muwatta, with gradings as recorded there; the English is our own rendering. Spotted a mistake? Tell us.