I used Butterick's B5912 toddler dress pattern (view B with the peter pan collar and puff sleeves). The pattern was fairly easy to follow but I had a lot of trouble with the collar. I've sewn peter pan collars before without any problems, but had to rip out the seams twice on the collar of this dress! I didn't love the size and shape of the collar either, so I made a few adjustments. I would probably draft my own collar next time. On the positive side, the sizing was accurate.
I wasn't able to find a metallic triangle print so I decided to make my own. I used DecoArt SoSoft Metallic Fabric Paint in Glorious Gold and made a stencil out of freezer paper. The nice thing about freezer paper is that one side is coated in wax, so you can iron it on to fabric and it will temporarily stick. It's perfect for stencils and cutting out shapes for appliques.
I used premium bleached muslin for the bodice and a cotton/polyester blend broadcloth for the skirt. The skirt looks somewhat gold in the pictures, but it's actually a warm green color...I believe it's called "Avocado".
And I couldn't resist making a coordinating hair clip. It's mistletoe!