Which of the following organisms produce a fibre that is not ideal to produce winter garments?

Muga is a silkworm that produces Muga silk. It is grown in wild in the state of Assam.

Silk is generally not considered a suitable material for making winter garments because it is lightweight and does not provide much insulation. While silk can be very warm when used in a layered fashion, it is not effective on its own for keeping the body warm in cold weather.

On the other hand, Cashmere, Pashmina, and Alpaca are varieties of wool used to make winter wear such as jackets, sweaters, etc.