Found them too wide at first go so ripped back to garter cuff and skipped the increases. Perfectly snug fit now

Increased 16 sts for thumb, cast on 2 additional stitches only.

Set aside thumb at eor 2r after last colour round.
M1l/r at beg/end of next round to close gap.
Knit 5 more rounds after that.
Dec 2 on first round of ribbing.
31r of ribbing.
JSSBO.

For thumb: pick up 2 on first round to close gaps, dec 2 sts 3 rounds before end.

43.1gr grey
1.9gr blue
1.1gr purple
1.8gr pink