You can't even tell you're wearing it.

Lartasian silk is an incredibly lightweight and soft substance that is also incredibly string, to the point where a knife has trouble penetrating cloth made of the material.
It is harvested from a species of sentient blue spiders. The Spinwix spider is known for its love of light hearted conversation while it weaves piles and piles of multicolored silk. If the conversation is particularly enjoyable, the spider often gifts the silk to whomever it has been talking to, sometimes as is, and sometimes it will even offer to weave a simple sheet of cloth from the silk to be altered and fitted as the recipient sees fit.

Skill

it takes great skill to create such a cloth before one even considers making something from it. The spider has no problem as it has an intimate knowledge of how It's silk works. The silk is the primary export of The House of Spiders, one of the most prolific Daimyo in Lartasia .

Manic Mutation

Spinwix are a product of Universal Mania and have mutated in many ways. The spiders produce significantly more silk than they should and almost constantly need spin or suffer pain. They don't develop spinners till adulthood and spend most of their life as young gathering food to bring back to the den to feed the broodmother.

Methods of Pontification

Getting the silk is easiest when talking two spiders that make it. Certain conversations are more likely to gain the gift of silk than others. The more profound, philosophical, and deep the conversation, more likely you are to receive the gift. Comedy has also been shown to be a favorite of the spiders.
While the spiders do enjoy conversation, one should never approach one without invitation. The venom is so toxic it can kill a man in a matter of seconds. The spiders are also very skittish, as they know how valuable what they make is to the people of Lartasia.

Proper Procedures

The proper way of approaching the spiders is to simply announce your arrival before you arrive. Make sure you are vocal so they can choose whether or not they wish to meet you. Should you see one, it is important to introduce yourself as soon as possible lest they try to eat you.

Cultural importance

The silk is considered a valuable commodity as its supplies most of the aristocracy in Lartasia with means of making their clothing. The silk have saved more than one head Daimyo from a would be assasin and the fact that they come in so many vibrant colors is considered particularly special as each Daimyo can cater the garments they create to the colors of their house.
The Daimyo routinely bring offerings to spiders they personally know in the hopes that it will make them more inclined to gift even more silk. House of spiders is the only daimyo to successfully domesticate the creature if domestication is what you call it.

Silk of Color

According to the legends behind the Spinwix, every spider has its own color of silk, and can always distinguish whether or not it to produce the silk garment based on this color. While it is impossible to detect with the human eye, the spiders can always tell and might become angry if accused of producing the silk in a garment they did not have a hand in creating. The spiders are often regarded as great Craftsmen in the nation and Merchants often use their names when selling garments made from their silk