4Story Lexicon

If districts in the war zones have been conquered by an enemy kingdom, you will not be able to speak to the NPCs there. Fortunately you can talk to them when wearing this disguise. If you use this clothing, you can trick the patrols, guards and quest givers and can talk to them. However enemy players will not be fooled by your disguise. You can buy these items from the merchants in your start village and in the capital of your kingdom.

After you have put on the disguise, you cannot accept any more quests in your own kingdom. To take off the disguise, click on the clothing-buff with your right mouse button and choose the item Remove effect. Afterwards you will be recognised as a character from your kingdom again.