Sumptuary Laws

Sumptuary Laws are restrictions on dress and lifestyle designed to limit extravagance. The purpose of these laws are to restrict the lower classes from putting on airs of their social superiors. The degree to which a nation has these laws on the books and enforces them, and they generally have them on the books much more than they enforce them, depends on how hierarchial the nation is. Some examples follow:
Arumelia:
Arumelia is a highly convervative country, and they have sumptuary laws out the yin-yang, and they enforce them. The countries that have come from Arumelia have them as well, though enforcement varies. Commoners are restricted from wearing primary colors in any shade, purple, or pastels in any color, are restricted from eating more than half a pound of meat per day unless at a feast or festival. Sometimes there are restrictions on when they can go to the theater or arenas. They are restricted from bearing arms, only allowed knives for utility.
The middle class has considerably more freedom. They are permitted any primary color but royal blue or purple, which is the sole domain of the nobility. They may not wear lace, or gold or silver thread. They may bear a rapier or a saber, but not a longsword or anything larger, and certainly no obvious armor around on the street. They may however own and wear military equipment during militia functions.
The nobility have few restrictions. They may not wear golden cloth, or royal blue, which is restricted to Arumelian Imperial Royalty. The nobility have the ability to waive these laws on certain of their followers. Obviously their guards and troops will be armed for bear, and their service needs to look good. Generally their common followers are allowed to dress in their noble patron's livery. Adventurers generally depend on a noble's patronage.
Spellcasters are also allowed some leeway. Prostitutes as well.
Women are discouraged from wearing trousers or pants. Calf length skirts are fine in this modern age in some places.
What this means for the Arumelian Throne Campaign:
Eli and Newall: You need to waive your posse. You are allowed to waive ten people at most at your current level (son of a baroness). As a noble spellcaster, you may be able to get away with golden cloth. What are your families' livery colors? What do you mean waive?
Gamon: You need Newall (or Eli) to vouch for you for your weapons. You wear black, right? That's fine.
Aagha and Sallis: Huge violation of numerous laws, including certain ones regarding pants or no pants. However, they kinda look like a prostitute and her guard, so they may get some leeway from that. How were they able to get away with it thus far?
Marsilla: Right now she wears common clothes. If you want to dress her up (like a lil' doll) you might want to use livery colors to make it legal.
NOTE: This stuff is on the books in Jartapur, and roughly adhered to, but enforcement is uncommon except in areas of more fussy nobles.
Empire of Trynser:
For years the rules they had were totally unenforced until finally the lace, blue cloth, and gold thread makers petitioned to have them removed altogether.
Nowadays, if a noble wants to stand out, they have their coat of arms emblazoned on their clothes.
Kasteban and some other communities are still known for some discriminatory laws regarding Thalosian dress, restricting them from color on their attire. In some places in former times, they had to wear a white circle badge.