Ingens Sweater is the perfect project for your leftover silk mohair. It has a simple slip-stitch-pattern that adds texture and the lovely triangle pattern. You only knit with one color at the time.
The sweater is knit top down. You start with the ribbed collar, then the yoke with the slip-stitch patter and short rows distributed evenly down the back. You then separate for body and sleeves that are knit separate with slip-stitch pattern and decreases in the sides. Ingens Sweater is designed to have little to no ease, but you may choose a bigger size to get a more oversized look.

Sizes: XS (S) M (L) XL (2XL) 3XL (4XL) 5XL

Measurements finished sweater:
Breast circumference: 88 (94) 105 (115) 126 (133) 139 (149) 156 cm/34.5 (37) 41.5 (45) 49.5 (52) 55 (58.5) 61.5 inches
Upper arm circumference: 27 (29) 33 (36) 38 (42) 46 (48) 50 cm/10.5 (11.5) 13 (14) 15 (16.5) 18 (19) 19.5 inches.

Needle sizes: 3 mm (US 2.5) and 4 mm (US 6), or whatever needle you need to hit gauge.

Gauge: 19 sts x 33 rows on 10 cm/4 inches in slip-stitch
pattern after blocking.

Yarn:
Main color: Knitting for Olive merino, 250 m on 50 g, held doubled with Sandnes Garn Tynn Silk Mohair 210 m on 25 g.
Contrast color: Sandnes Garn Tynn Silk Mohair, 210 m on 25 g, held doubled.

The merino may be substituted with any other light fingering merino or wool blend, and the silk mohair can be any brand with similar yardage.

Yarn quantity:
Main color: 100 (150) 150 (150) 200 (200) 200
(250) 250 g Knitting for Olive Merino
250 m on 50 g. AND 75 (75) 75 (100)
100 (125) 125 (150) 150 g Silk Mohair,
210m on 25 g
Contrast color: 75 (75) 100 (100) 100 (125)
125 (150) 150 g Silk Mohair, 210m on
25g. (This is enough to hold doubled.)

You will also need: Stitch marker, stitch holder/waste yarn, scissors, measuring tape and a needle to weave in loose ends.

All photos: Tale Hendnes