Being skinny does make you feel colder than someone who has more fat.
When you're skinny your body can easily get more cold faster than someone who is fatter as the fat person has more insulation which is the fat.
When you're skinny you don't have all that fat as insulation so the cold gets to you much faster.
I'm skinny and I can start shivering really bad when it gets to 50 F while someone who is fat or at least has more weight to them feels warmer in those temperatures.
Fat in your body is a good insulator so you feel warmer than someone who is skinny.
Your body helps produce heat through the use of muscles which help produce the body heat through metabolism.
Our bodies begin shaking when we are cold so that our bodies can warm up.
Although being fat is not always a good thing as being too fat and overweight can lead to heart conditions, heart disease, heart attacks, diabetes and strokes.