Does my llama need a coat? Llamas have a God-given winter coat already, don't they? Why would they need an artificial coat? It's true that llamas have a splendid covering of hair or wool or fleece. (I've heard it called fur, as well. Technically, it's hair) Classic llamas are blessed with a warm undercoat and an outer layer of guard hair. This is a great system for keeping warm in the winter and cool in the summer. (the undercoat sheds out in the spring) Even woolly llamas, who generally need to be shorn to keep cool for the summer) usually grow enough hair back to stay warm.
The fact is, most llamas do not need to wear a coat. Llama wool is naturally very insulating, and a blanket tends to compress their wool, which reduces its insulating properties. Shelter from the wind and snow, good bedding, and good hay are most important in cold weather for keeping llamas warm. Eating forages generates heat through the digestion of long fibers of hay. Feeding free choice hay during extremely cold weather will help your llamas stay warm. (Alfalfa is excellent for older llamas.)
If your llama is old and thin, or was shorn late in the season and hasn't grown enough wool, then a blanket is a great idea. Lightweight blankets won't compress the llama's own coat, and add a layer to trap warm air.