It is interesting to remember this fact, because even our most highly civilized forms of clothing still show this same tendency.

The skirt, for instance, is simply a survival of the lower end of the blanket, which has never been cut down to fit the limbs.
The principles upon which garments should be built are two: First, they should fit closely enough to the body and limbs to protect them from either injury or cold, even while free activity of every sort is allowed--you could not wrestle in a blanket or run very far in a sack.
Second, they should be thick enough to protect us from cold, and yet at the same time porous enough not to interfere with the natural breathing and ventilating of the skin.

A garment should be as loose as possible without interfering with our movements, and as free and as light as can be worn with reasonable warmth and protection.

The less clothing you can wear and be comfortable, the better.
We should particularly avoid binding or cramping the chest and the hips and waist.

If clothing is too tight about the chest, it interferes both with free movement of the arms and, what is even more important, with the breathing movements of the chest.