It was reflective to what he believed, the loin cloth. He wore cloth to protest british rule. They banned it so he wore it.
He wore this cause it was an indian tradition.
Mahatma Gandhi chose to wear a loin cloth or a dhoti, reason being that it was best suited for the hot Indian climate. Suits, ties are not suitable for the hot, dusty Indian summers! A dhoti is best suited for our climate.
He liked being natural and he wore like a blanket which lots of people still wear as india has hot climate