I learned early on to seek advice, whether from Colin Fletcher or other sources, but then rely on my on my own needs and experience. Whether backpacking, camping or day hikes over a period of time we are shaped by our own personal needs rather than some generic advice from a book, salesperson or video. It's what fits our needs and not the needs of someone else that's important.
As far as sleeping naked, I sleep naked at home so I've found that doing the same backpacking or camping is more comfortable and helps with the transition to sleeping outdoors, although in cooler temps I'll wear a light shirt.