I think this is the start of your problems. Your base layer is the wrong material. Cotton is going to soak up sweet and will loose all its insulation value. Try the same hike with some appropriate type of base layer.

Adam

PS I’ve often been amazed at the photo’s I see on the internet of people practicing survival technique’s but yet they have the worst type of clothing on to be in the outdoors. I became interested in survival techniques because of my hiking/backpacking hobbies. Clothing was the most important thing to learn about but seems to be a none issue with most survival type people, they seem more interested in a back pack full of knives instead of a good set of cloths and a sleeping bag.