Scraps from his mom's dress serve as the lining, underlayer for the trunk hose and part of the trim. I had a random piece of brow/gold fabric that matched the contrast on Fia's dress and makes his jerkin and the panes for the trunkhose. The trim is just more of the metallic yarn trim I made couched down.
I just made up the pattern on the fly, laying down one of my son's shirts and cutting a vest following the shape. I added some shoulder wings, a collar, and some skirts and called it good. Sewing for little people with no actual shape has some advantages when it comes to reckless disregard for fitting. I had planned to put on some little heart clasps to hold the jerkin closed, but turned that over to Fia. She got them in place for Solstice and I think it carries the heart motif over nicely into his suit.
Missa's floppy brimmed pleated hat tutorial. It has a felt inner and more of the blue satin as the outer. I embellished with bronze and black ostrich feathers and a random feather pick I got on clearance. Because every little boy needs a jaunty cap.