I think that is a personal choice but I will try and answer. We just started fulltiming. We sold the stick and brick home and bought a used MH. Having read mucho many blogs from fulltimers we started getting rid of many of our clothes and
shoes. The fulltime life is different. You will not need a lot of business type clothes or other dress up clothes. Leisure clothes - shorts and short sleeve shirts for those hot days, jeans and a few other pants and sweatshirts/jackets for those colder days. I kept one suit and my wife one nice outfit for funerals or weddings.
Of course the closet size and storage in the RV will dictate how much you can haul around with you. Some store their winter clothes in their basement storage area and vice versus in the summer. We have clothes we have not used and will be donating more to goodwill next year.
Good luck and welcome to the Forum. Keep us posted as you progress towards your RV adventure.