Here is the pattern for the Carnival Fingerless Mitts.
This pattern comes in three sizes. Small will fit 3 years plus. Medium will fit teenager to medium adult. Large is a large adult size. There is also tips included to make custom sized gloves, so you can ensure the perfect fit once you know your way around the pattern. I find the medium size fits the majority of teens and adult hands though :)
Obviously depending on which size you will use different amounts of yarn. But I have found the large size takes between 75-80g of a 100g skein at 166m.
Gauge is not super important for this pattern, but if you are a very loose or very tight crocheted and are worried then go down or up 0.5mm on your crochet hook.
I had fun making all the sizes for this when my friend sent me some pictures and doodles of the kind of gloves she loved but wanted to be specific. They are super quick to make in all sizes.
This is my first pattern I have shared, so if you have any questions or find and error, please drop me a message :)