I doubt that there is much lanolin in the wool after it has been scoured and processed to get it clean for spinning.

These days a lot of the wool is treated to be washable, but there is no way to tell if the manufacturor doesn't lable it as washable, other than applying heat, soap and agitation and have it turn into felt, which is exactly what is not required in a kilt.

There are instructions on the forum on how to hand wash a kilt, it is not too difficult, it just requires a bit of care.

I tend to use a splosh of cheap (Human) hair conditioner on wool and wool mixture garments, once the detergent is rinsed out, then give a final rinsing with a small amount of white vinegar added, as wool likes an acid pH.

As long as you always use the right temperature for the iron, and a damp pressing cloth you should not have any trouble pressing your kilt.

Anne the Pleater