I've redone the cost structure for picking up approved tailoring
patterns. If you're interested, the formula for the cost (in gold) looks
like this:

1000 + (item_prestige * 300) + ((item_prestige - 5)^ 1.313) * 500

Item_prestige is a number assigned to a pattern based on how expensive
it would be to produce that kind of item. In other words, the nicer the
clothing, the more expensive, but the difference between this formula
and the last one (which was simply a gold amount multiplied by prestige)
is that the price starts a lot lower at low prestige, but climbs much
faster than a 1 to 1 ratio as the prestige rises.

The reasoning behind this is that if you want to wear normal clothing,
it can be reasonably priced, but if you want to wear exotic super-nice
clothing made of silk or with gold thread embroidery, or something
complicated like a wedding dress, it's going to be expensive.

Penned by my hand on the 16th of Aeguary, in the year 313 AF.