A one of piece. The black felt fabric is handmade. It's a combination of a recycled knit and bits of knit trims embedded into merino wool. The colors in this are rainbow. Some metallic. 

The back neck has 3 buttons. The sides and sleeves are new fabrics. 

Measurements: 

Underarm to underarm 24 or 48"

Hem to hem approx. 33" or 66" around

Underarm to hem approx. 24" because hem is uneven

Underarm to wrist 17"

Shoulder to shoulder 17" 

Center-back approx. 33"