AsSalam Aklaikum.
Can sombody throw daleels for "is it necessary to wear cap/hat/imama during salat?"
as in india hanafi school of thought req one sgould wear cap else salah is not accepted.

even though i dont understand the point of having this post in the thread, question itself has so many mistakes but since you've brought it let me clarify your confusion or misconception. there is no such fatwa by hanafi scholar be in pakistan or india or turkey or aghanistan etc where hanafi madhab is dominant that topi (cap) is compulsory in salaah. it is sunnah, and having said that, sunnah is encouraged to be applied in muslim life and not to be discouraged after saying that it is sunnah. thats whay all ahle sunnah scholars emphasize to cover up their head all the time esp. in salaah when person is actually talking to Allah SWT, more adab and preparation is required and be practiced.
here is the fatwa from askimam.org fatwa site about topi.
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It is not Waajib to wear a Topi. It is Sunnah. A Muslim male should wear the Topi at all times. If he unfortunately does not do so, then he should at least respect the Salaat and put on a Topi for Salaat. Your friend's claim is incorrect. (Refer below) and Allah Ta'ala Knows Best
Moulana Imraan Vawda FATWA DEPT.
CHECKED AND APPROVED CORRECT: Mufti Ebrahim Desai
Abu Kabsha (Radhiallaahu Ánhu) narrates that the hats of the companions of Rasulullah (Sallallaahu Alayhi Wasallam) used to be round and spacious. (Mirqaat vol.8 pg.246)
It is narrated by Tabrani on the authority of Ibn Umar (Radhiallaahu Ánhuma) that Rasulullah (Sallallaahu Alayhi Wasallam) used to wear a white hat. (Ibid)
Hassan Basri (Rahmatullah Alayhi) states that the people (Sahaaba - Radhiallaahu Anhum) used to make Sajda (prostrate) upon their turbans and hats. (Bukhari vol.1 pg.56; Rashidiyya)
Mullah Ali Qari (Rahmatulah Alayhi) states that the wearing of the hat has become one of the salient symbols of Islam. (Mirqaat vol.8 pg.246) It is the only outward and unique salient feature that distinguishes a Muslim from a non-Muslim. No other community group or people wear the Muslim type hat.
Source