GOOD BONES Sample B (red and navy) shown in size M with 3 inches/7.5 cm of ease at largest part of chest and 1.25 inch/3 cm long bust darts, short sleeves

Sample B (red and navy with short sleeves)
C1 Madelinetosh Tosh Merino Light 100% superwash merino; 421 yd/385 m per 100g skein; color: Plaid to the Bone; 22, 2, 3, 3, 4, 4, 4, 4, 4 skeins
C2 La Bien Aimee Merino Singles 100% superwash merino; 400 yd/366 m per 100g skein; color: Undergrowth; 22, 3, 3, 4, 4, 4, 4, 5, 5 skeins

Sample B uses two 1 ply singles, in fingering weight. One is wildly variegated and the other is tonal.
For best results choose fingering-weight yarn pairs that have a similar number of plies: 1 ply with 1 ply, 2 ply with 2 ply and multiple plies together.