After marriage it is the custom for women in Nepal to dress only in red. I am not sure who was the originator of this tradition but in terms of Ayurveda and Jyotish which are two of the most ancient and profound sciences that have been given to the world by the Rishis, this is absolutely not appropriate, it is actually quite dangerous to the home, the marriage and society. Let me explain why.
Ayurvedic View
Each colour has an effect on tridosha and subsequently will affect body and mind. Red is the shortest wavelength of all colours and hence is a hot colour that is absorved vibrationally by ranjaka pitta in the skin and has a waming effect on the physiology. Women are energetically cooler than men; they have more kapha and are more lunar. In ancient Ayurvedic terminology we would say women contain more natural Soma. Now red is an Agni or fire colour and thus the opposite of the natural nature of a woman. In moderation it would be fine, but as a daily dish (the skin vibrationally ‘eats’ whatever we expose it to), it’s not on. It will reduce the cooling lunar qualities of the woman and increase Agni or Pitta.
Jyotish View
Red is related to Mars, not ironically it is the ‘red planet’ in our solar system. It’s reflected rays of sunlight are indeed in the red spectrum mostly. In any marriage too much Mars, especially in a woman, will make her have more difficulty relating to men. She could try to dominate or control them or be a little less than lady like in her behavior. So having mars (which is strengthened by the wearing of red colour) too strong in a woman is not ideal.
So this tradition as deeply rooted as it has become should be question and though through. White would be a much safer and more logical colour for the women of Nepal.