13 colored fair isle.

From the pattern:
In this V-neck, dropped shoulder, wave-pattern cardigan, bright patterns on shaded blued waves create the impact.

Yarn Requirements

2/3/3/3/3 in pale blue mix (shade #1280)
2/3/3/3/3 in sky blue (FC49)
2/2/3/3/3 in dusky blue (33)
2/2/3/3/3 in bright blue (FC47)
4/4/5/5/6 in dark blue (135)
1 in tangerine (90)
1/1/2/2/2 in rust mix (FC38)
1/1/2/2/2 in pink mix (1289)
2/2/2/3/3 in flame red (129)
1/1/2/2/2 in turquoise (FC34)
1/1/2/2/2 in flame orange (FC7)
1/1/2/2/2 in bright turquoise (132)
1 in bright pink (70)