Be very careful with earrings and jewels when you put on the clothes, since they snag easily. Alpaca fibers love water, and become softer and softer with each wash.
Wash by hand in lukewarm or cold water, using soft, organic washing liquid for wool, or even hair shampoo.
Do not use any chemical shampoo or detergent.

Rinse at the same temperature as the wash.
Gently dry by hand, and let it dry flat on a towel.

Iron at 110° centigrade (230° F) max, with a little bit of steam.

Storage: protect your alpaca against moths, and check if your closets do not contain any.
Always clean and steam iron before storing.
For safer protection, keep it in an airproof plastic bag.