1. One should wear trousers or a lungi under one’s kurta. One should avoid wearing Bermudas/jammies under the kurta.
2. The clothing one chooses to wear should not have any emblem or logo that has a kufr connotation or is a sign of kufr e.g. the cross, devil, Nike tick etc.
عن ابن عمر رضي الله عنهما قال : قال رسول الله صلى الله عليه وسلم : من تشبه بقوم فهو منهم. (أبو داود رقم 4033)
Hadhrat ibn Umar (Radihyallahu Anhuma) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “The one who emulates a people will be counted from amongst them (in the court of Allah Ta’ala).
عن عبد الله بن عمرو بن العاص قال: رأى رسول الله صلى الله عليه وسلم علي ثوبين معصفرين فقال إن هذه من ثياب الكفار فلا تلبسها (مسلم رقم 2077)
Hadhrat Abdullah bin Amr (Radhiyallahu Anhu) reports: Rasulullah (Sallallahu Alaihi Wasallam) had seen me wear two yellow-coloured pieces of cloth. He said: “This is from the clothing of the disbelievers, therefore do not wear it.”