I was looking at patterns today and found a number of items described as capelets.
The flamingo capelet had long sleeves and a tie front, the Grand Plan Top-Down Capelet is either an elbow length poncho or cape. The Anthropologie inspired capelet has short sleeves and and a back and front more reminiscent of a mini cardigan.
Designers have the right to name their garments; however calling everything that only comes to the waist a capelet is misleading at the best and preventing people from finding their patterns at worst. When I do a search for a capelet I expect to see something like this:

If you say poncho people think pointy front and back so a curved poncho


Where it gets very confusing is where a capelet has sleeves. How can something that has sleeves be described as a mini cape? I don't know about you but I have never seen a cape with sleeves; that would be a coat!

Then there is the Flamingo capelet mentioned above, it is well fitted and constructed with 2 fronts, 2 sleeves a back and ties. Isn't this a cardigan?
I will just have to include capelet in searches when I am looking for any sort of garment that is designed to cover the shoulders. A jumper/sweater hasn't come up in a capelet search yet but the way things are going it is only a matter of time!