Well, have you ever wondered from where your friend has this nifty new hair, shoes, skirt, whatever (s)he's wearing, but (s)he's not telling you from where this stuff comes? There's a simple, builtin mechanism into the client to find it out without the owner noticing it at all.
First, let's take a look at an typical, advanced Second Life avatar - me. Here is a recent picture of myself:
Ok, what are you seeing on this picture? I am wearing some kind of hair, that's made out of prims and attached to my head. My shoes are in reality attachments made out of prims, too. This technic I am describing only works with attached objects to the avatar, be it hair, necklaces, rings, shoes, flexi skirts, weapons and other stuff, even when the attachments are phantom. So it is not going to work just on clothes and other stuff without attached prims to the avatar.
First, let's take a look at our example picture:
In this tutorial we want to locate the creator of the shoe being displayed at this picture. It would also work with the flexi part surrounding the leg, by the way.
The first necessary step is to right click the object of desire, here the white shoe. Your screen should now look something like this:
The selected object is being displayed highlighted and a pie menu is showing up. Select "More >" on the pie menu and left click it. Now you should have something like that:
A second pie menu with just four options; select "Inspect" this time and left click on it. When you've done it right, there' going to be a new window named "Inspect Objects" on your screen which looks something like this:
This window is the object inspection window, showing you the owner of the object being inspected (which is here grayed out on purpose) and the creator of the object. The name of the object is being displayed in the first line of the inspection window, here something like "SILVER/WHT Legacy". This is important to remember if you want to get a copy on your own of this object, later. Left click on the button "See Creator Profile...", then you should see the profile of the object's creator coming up, in this case this profile here:
Voila, we are finished and we've successfully investigated the creator of this object. Normally the store of the object should be available under the Classifieds or Picks of the creator. Go to the store, look for object whose name you've inspected earlier and you're done without the other avatar knowing at all that you've investigated the object's name and creator on him.