I wrote this pattern as I made a jacket for little Gustave, so that I would be able to replicate it should he need another. I hope that it can be of use to others that also haven’t been able to find decently fitting jacket.
Unfortunately I was only able to write it in the one size, as I didn’t have any other Daxies to compare it to, but I’m assuming Gustave is average sized, not overly small or big. As I have indicated on the pattern, changing your needle size up or down should give you a little leeway between sizes.
The yarn I used was Elle Pullskein, in the colour Royal, but any DK yarn should work well. I used 3mm circular needles, a yarn needle for sewing in ends and scissors.

I used just under one 100g ball (approx. 300m / 330yds)