"......insanityOO7, Any phrase followed by "i.e" means it is subject to interpretation. Simple logic, niqab is compulsory while it's forbidden for women to wear during pilgrimage?........."

Ok, read the content before the i.e

Secondly, Prophet Muhammad SAWS was sent to mankind to explain the revelation to us (so that there is no room for misinterpretations); as Quran says:

With clear signs and Books (We sent the Messengers). And We have also sent down unto you (O Muhammad SAW) the reminder and the advice (the Qur'ân), that you may explain clearly to men what is sent down to them, and that they may give thought. (An-Nahl 16:44)

So what was explained by Prophet and what was understood by the companions w.r.t this verse is very clear and is present in hadith:

Narrated Anas ibn Malik: "I know (about) the Hijab (the order of veiling of women) more than anybody else. Ubay ibn Ka'b used to ask me about it. Allah's Apostle became the bridegroom of Zaynab bint Jahsh whom he married at Medina. After the sun had risen high in the sky, the Prophet invited the people to a meal. Allah's Apostle remained sitting and some people remained sitting with him after the other guests had left. Then Allah's Apostle got up and went away, and I too, followed him till he reached the door of 'Aisha's room. Then he thought that the people must have left the place by then, so he returned and I also returned with him. Behold, the people were still sitting at their places. So he went back again for the second time, and I went along with him too. When we reached the door of 'Aisha's room, he returned and I also returned with him to see that the people had left. Thereupon the Prophet hung a curtain between me and him and the Verse regarding the order for (veiling of women) Hijab was revealed." Sahih al-Bukhari, 7:65:375, Sahih Muslim, 8:3334

Narrated Umm Salama Hind bint Abi Umayya, Ummul Mu'minin: "When the verse 'That they should cast their outer garments over their persons' was revealed, the women of Ansar came out as if they had crows hanging down over their heads by wearing outer garments." 32:4090. Abū Dawud classed this hadith as authentic.

Narrated Safiya bint Shaiba: "Aisha used to say: 'When (the Verse): "They should draw their veils (Khumur) over their necks and bosoms (juyyub)," was revealed, (the ladies) cut their waist sheets at the edges and covered their faces with the cut pieces.'" Sahih al-Bukhari, 6:60:282, 32:4091.

Now there is a general rule and there are exceptions. Both have been mentioned and explained by prophet muhammad SAWS.

The best generations in islam is that of the Sahabas and they understood and acted upon the preachings of this verse as mentioned in above hadith, and there is a unanimous agreement fo all major scholars/imams of Islam on this subject.