The kilts and jackets have buttons, zips and chains so these clothes should not be wash by automatic machines or manual machines. The Care Instructions hand wash is the best way to wash these clothes.
After wash the clothes dry these clothes manually by using rope. There are automatic dryers but they are good for pants and shots not for kilts and jackets.
Whenever you wear the kilt, never tighten the kilt with the belt. Try to wear loosen fit kilt every time.
For best wash, you best quality cleansing agent. There are many fake or low standard cleansing agent out in the market but these may harmful for the clothes.