No you don't have to wear special clothes on a pilgrimage
Yes, it is an important Catholic place of pilgrimage.
A Pilgrimage !
There are regular pilgrimage tours to the Marian Shrine at Knock. Your Parish Priest may be able to help you in this matte
From the name of a French town, the site of a large Catholic pilgrimage.
Sikhs do not believe in "blind ritual" such as pilgrimage
Well i dont have an in depth answer for you. What i can say that Protestants are Christians. I assume you mean the difference between Protestant and Catholic.
They wear as they wear anywhere else except if they are om hajj (or pilgrimage) then they wear what is required during hajj. See question below.
First of all, many other religions have pilgrimages. The Hajj is a massive pilgrimage that Muslims do. There are many other examples. So lots of people who are not Catholic go on pilgrimages relating to their own religion. If you are talking about non-Catholics going on pilgrimages associated with Catholics, then there are various reasons why they might go. When there is a Catholic pilgrimage, people don't have to prove they are Catholic before they go, so anyone can go. Some may be another denomination of Christianity and so share some beliefs and so might have an interest in going. Some go out of curiousity. Some may go out of a professional capacity, such as a reporter doing some work on the pilgrimage. Some may be brought by some Catholics hoping that they will get some benefit out of it. Some people may be thinking of becoming Catholic and may go on a pilgrimage as part of their exploration in Catholicism. So there are many reasons why a non-Catholic may go on a Catholic pilgrimage.
Lourdes is a pilgrimage site for our Lady in the south of France. People fast and go without sleep while on pilgrimage in Lough Derg in Ireland. Fatima is a pilgrimage site for our Lady in Portugal. Many people go in the walk for the pilgrimage to Santiago de Compostela in Spain. Vatican City is a place of pilgrimage as it is where the head of the Catholic Church lives.
Lourdes, the site where the Virgin Mary appeared to St. Bernadette.
Pilgrimage was something that we did when the Temple was still standing (Deuteronomy ch.16). It was destreoyed 2000 years ago. No special clothing was required.