Question: Is there a Hadith for the recommendation of wearing green clothing? Or that it is the clothing of the People of Jannah as the Suffiyyah do [i.e. they wear green]?
Answer: “As for the issue of recommendation, then we do not know of any recommendation. Recommendation came in regards to white clothing*. Wearing specific colors, like green, has spread among some of the people of innovation in some lands. If this is a symbol for the people of innovation, then what is appropriate is not to wear this symbol”.
[Sharh Sunan Abi Dawood no. 456]
One proof for the recommendation to wear white clothing is what is reported on the authority of Abdullah bin Abbas (may Allah be pleased with him) that The Prophet (ﷺ) said:
عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم “ الْبَسُوا مِنْ ثِيَابِكُمُ الْبَيَاضَ فَإِنَّهَا خَيْرُ ثِيَابِكُمْ وَكَفِّنُوا فِيهَا مَوْتَاكُمْ وَإِنَّ خَيْرَ أَكْحَالِكُمُ الإِثْمِدُ يَجْلُو الْبَصَرَ وَيُنْبِتُ الشَّعْرَ
Wear your white garments, for they are among your best garments, and shroud your dead in them. Among the best types of collyrium you use is antimony (ithmid) for it clears the vision and makes the hair sprout [Saheeh Sunan Abi Dawood no.4061]
Faisal bin Abdul Qaadir bin Hassan