This is a pattern for a pair of lined mittens worked from the bottom up and in the round, using the stranded colourwork technique.

The outer mitten is worked from an i-cord cast-on. The outer mitten is worked first before the lining, which is then picked up from the inside of the outer mitten.
You may use the same weight or a slightly lighter weight for the lining (as seen in the sample: outer mitten with Shetland 4 ply and inner with Hawkcombe Wood Collection).

There are charts for Left and Right mittens. Size is determined by the needle size (a chart with a slightly larger thumb width is also included, if needed).

Lighter Mitten charts are included, if these work better with your printer or viewing platform.
In addition, there is an explanation for the Ladderback/Invisible Jacquard technique with sample and image on page 8. You may find this technique helpful if you are not lining your mittens.

You may also work the mitten without a lining and from a ribbed edge.

yarn:
Shetland 4ply by Gathered Sheep Yarns; Fingering; 100% Pure Shetland Wool; 234yds (213.97m) / 55g
Hawkcombe Wood Collection 4ply by Gathered Sheep Yarns; Fingering; Exmoor Blueface 50%, Devon BFL 30%, Devon Wensleydale 20% ; 212yds (194m)/50g
approximate yarn amounts for a pair of mittens:
MC (Dark Arts) - 28 (30, 32, 38) g; 120 (128, 137, 162) yds/ 109 (117, 125, 148) m
CC (Blue Haze) - 24 (26, 28, 33) g; 103 (111, 120, 141) yds/ 94 (102, 109, 129) m
Additional 55g ball of Shetland 4ply OR 50g ball of Hawkcombe Wood Collection, if you would like to work lining. (sample uses Hawkcombe Wood in Mighty Oak) 38 (40, 42, 48) g; 162 (170, 179, 205) yds/ 148 (156, 164, 187) m
needles:
2.0mm (us no 0) DPNs 6in/15cm; set of 5
2.25mm (us no 1) DPNs 6in/15cm; set of 5
2.5mm (us no 1.5) DPNs 6in/15cm; set of 5
2.75mm (us no 2) DPNs 6in/15cm; set of 5
3.0mm (us no 2.5) DPNs 6in/15cm; set of 5
Each size uses a different needle size pairing:
2.0 & 2.25 (2.25 & 2.5, 2.5 & 2.75, 2.75 & 3.0) mm
gauge:
34 (32, 30, 28) sts x 34 (32, 30, 28) rows = 4in/10cm measured over stranded stockinette
approximate finished size (outer mitten):
7.5 (7.75, 8.5, 9) in / 19 (20, 21, 23) cm circumference
Size is determined by needle size. With lining, the inner circumference is decreased approximately 0.25in/0.5cm using a needle one size smaller.
additional tools:
needle to weave in ends, waste yarn/stitch holder