This is a classic Aran cardigan that emphasizes the best things about knitting to create a flattering garment. This sweater is customized to the wearer at every stage and so is measured a bit differently.
To determine your size measure around your ribcage just under your bust (approximately your bra size, but not the cup size). If you are between sizes choose the smaller size, as the sweater will stretch. Do not factor in ease.  
A: 28”/71cm
B: 31”/78.5cm
C: 33.5”/85cm
D: 36.5”/92.5cm
E: 39”/99cm
F: 42”/106.5cm
G: 45”/114.5cm
H: 47.5”/120.5cm
I: 50.5”/128.5cm
Sleeves are 22”/56cm long and are adjustable
Ties are 14”/35.5cm long and are adjustable
Skirt is 12”/30.5cm long and is adjustable

Yarn: Berroco Lanas Light.  
100% wool
3.5oz/100g
550 (605, 654, 706) (755, 816, 873) (917, 971)g
6 (7, 7, 8) (8, 9, 9) (10, 10) balls
Note: Due to the variability in size for this sweater, yarn amounts are also variable. Amounts given are for sweaters that are similar to the sample at each size.
Gauge: 21 sts and 36 rows = 4/10cm on stockinette and using size US 4/3.5mm needles taken after blocking

Needles: 
Body: Size US 4/3.5mm 30”/80cm (or longer) circular needle.
Trim: Two size US 4/3.5mm DPNs or small circular needles. 
Small Circumference: Your preferred needles for small circumference knitting in same size. 
Note: Use the needle size needed to achieve gauge.