As in "She gave him a "come-hither" look.
I found nothing except the date of first use (1925), which has no source.
The noun, 'come-hither', derives from the verbal phrase, 'come hither'. The first attestation as a noun shown in OED Online is from 1900:
An invitation to approach, so fig. enticement. Chiefly in attrib. use, with look, eye, etc. Also as adv. (Cf. comether n.)
1900 Daily News 10 July 6/2 It's no' the money, and it's no' the looks. It's jist the come hither in the eye.
["come-hither, n.". OED Online. September 2016. Oxford University Press. http://www.oed.com/view/Entry/36850?rskey=ziZqlA&result=2&isAdvanced=false (accessed September 14, 2016).]
Much earlier attestation is readily found with contemporary popular news archive searches, wherein the noun is often used with 'put':
In these uses the derivation from the verbal phrase is quite evident.
The noun form cross-referenced in OED Online, 'comether', represents a dialectal pronunciation of 'come-hither':
Etymology: A dialect pronunciation of come hither, used as a coaxing invitation to cows, horses, etc.
dial. or colloq.
In to put one's (the) comether on: to exercise persuasion or coaxing on, to persuade over, coax, wheedle; to get under one's influence.
1838 S. Lover Handy Andy ii. 22 He..looks pistols at any one that attempts putting his comether on the widow.
["comether, n.". OED Online. September 2016. Oxford University Press. http://www.oed.com/view/Entry/36878 (accessed September 14, 2016).]
An earlier attestation for 'comether' than that given by OED Online is also available through the aforementioned news archive searches:
Further investigation with specialized dialect resources may reveal regional sources (from the evidence shown, Ireland) as well as earlier attestations.