Pattern suggestions for the kiddies:
Simplicity 4944, size A includes childrens 3,4,5,6,7,&8
There are four outfits, two are long dresses for girls, empire waisted with long draped sleeves. Then there are two outfits for boys, one is a pirate with coat, pants, neckerchief and belt; the other is a soldier with fabric 'breastplate', helmet, cape, faux boots and bracers. I have a feeling you might have this pattern though...
Simplicity 3680, size A includes childrens 3-8 as previous pattern
It shows five outfits, all made out of the same dress with a combination of overshirt, corset-belt, and pantaloons-ideas shown are witch, hippy, mini pirate wench, cowgirl, and pixie-I could see some of these as working for a little kender.
Simplicity 3614, size A include girls sizes 7,8,10,12,14
Not sure if this would work but throwing it out there-very similar to 3680 but for big girls, with lacing around the waist instead of overskirts and corset-belts, dress has empire waist and gathered then draped sleeves in most, also pants and skirt. Costume ideas pictured are catgirl, pixie, slumber party girl, gypsy girl, witch, and native american girl. I think the gypsy or pixie could also work(minus wings and wand for latter) for an elf ;)
These are what I have(with intent to make stuff for nieces) that might also work for you-there are more I may look up later, and add links to photos, working off pattern envelopes on my table, not website on my desktop.