Nice job on your first fingerless mitt! And with a thumb, no less - my first couple of fingerless mitts didn't have a proper thumb gusset.

I did think about just binding off the opening, but having looked at two videos, decided "I can do that...maybe..." and dove in to try. Now I know what I don't know, and now directions make more sense when I hear/see them.

It went on Richard's hand, but the thumb opening was tight on him. It's not on me; it's comfortable without being loose-bulky.

Comfortable to wear is important.

That looks to be a beautiful fit.

Two questions: (1) Have you ever knitted gloves? That is, with fingers? (2) being fond of wearing fingerless gloves, myself, have you attempted knitting fingerless gloves?

This is my first attempt at knitting a fingerless mitt (or glove.) There are previous posts with more explanation and pictures. The second one is started but a) I got the Editor's Letter for the next book and started working on that and b) it heated up here and I don't need it. What did you think this thing was if NOT a fingerless glove?

Sorry about my unclear terminology. To me, what you showed was a fingerless mitten. What I've been calling fingerless gloves could more accurately be called "gloves with partial fingers" (extending approximately to the joint between the proximal and middle phalanges). I've had several pairs of these knitted for me, and I use them in all but the coldest weather, as they allow me to manipulate things almost as well as if I were not wearing gloves, but my hands don't get as cold. (I can play a keyboard wearing them.)
I'd expect the more mittenlike fingerless gloves to sometimes scrunch back and expose too much of the hand, which is not a problem with the short, open fingers.
They look more complicated to knit than completely fingerless gloves, but probably less complicated than full-fingered gloves, since the fingers are shorter and finished without closing.

I've seen "fingerless mitt" (not mitten--though it's an obvious possibility) and "fingerless glove" used interchangeably in knitters' discussions, though that could be the writers' errors.

For the temperatures we get down here, I think the fingerless mitt, which will be simpler to make than a glove with partial fingers, will suit me fine. Outside I need leather gloves, for the things I do outside. Inside, typing, I need less coverage than partial-finger coverage. Most gloves (and especially fingers) are knit with small needles than I can easily use.