Recettear contains 33 types of items for the player to obtain, use, and/or sell.
Items have types and categories. For example, the Wool Hat's type is hats, and some of its categories are: hats and something warm. When clients request an item, they don't usually say the name or type of the item, instead, they ask for items that satisfy a category.
Each saved game has a limit of around 15,000 items. Similar items count for that limit, even if they appear stacked in the list of items. Over that limit, no more items can be obtained unless some are removed from the inventory first.
For more in-depth information on Items you can visit here.
For items that are red, sell them at 250% plus the percentage of how much you'd normally sell to that person.
The girl for instance, you'd sell a red named item to her for about 264% give or take a little seeing as her highest percentage is 114% just add the 14% to the 250%.
For Arma you can sell red items to her at about 280% seeing as she accepts items sold to her at about 130%.
Sometimes they aren't willing to go at that price so be prepared to go below the 250% mark. Which isn't such a big deal seeing as its a lot more than what you'd usually have for that item.
Prime is a good example of this.
Only one weapon can be equipped at a time.
Only four total wearable items can be equipped at a time, and only one item from each type can be worn at a time. There are other restrictions noted below on items that cannot be worn if an item of another type is already equipped.
Accessories and Other Wearable Items