S. R. Faruqi:

On refinement in providing sensual pleasure, and on the delights of touch and and sight, very few such superb verses will be found. Both gātī and gāt mean 'body', but both are also used with the sense of 'breast, bosom'. (A verse of Atish's will be given below.) Thus the erotic suggestion becomes manifest. The meaning of jhurmaṭ is 'to cover the head and shoulders with a shawl or chadar, etc.'. By gātī bāñdhnā is meant 'to wrap a dupattah, shawl, chadar, etc. and tie it in such a way that the body would seem well bound up'.

Thus the beloved has wrapped one shawl tightly around her body, and has wrapped another shawl to cover her head and shoulders. That is, she has two separate veils. But in doing gātī bāñdhnā , the body to a great extent becomes visible. And the shawl, which is usually embroidered with flowers, is creating the effect that the beloved's body is in a dense mass [jhurmaṭ] of flowers.

Nur ul-Islam Muntazir, a pupil of Mus'hafi's, also has an interesting verse:

hāle ko hilā deve junbish tire bāle kī
ik chāñd sā chamke hai jhurmaṭ meñ do-shāle kī

[the movement of your hoop-earring would cause the halo [around the moon] to sway
something like a single moon glitters in the wrappings of the double-shawl]

Atish is his own kind of poet (although he is an 'Ustad-brother' of Muntazir's, he obtained nothing from Mus'hafi); on the emotional level, he usually remains unsuccessful. Thus here he too has used gāt and gātī as Mir has, but they've remained only words:

jis ne bāñdhe huʾe gātī tujhe dekhā phaṛkā
dil-rubā shai thī mirī jān tirī gāt nah thī

[he who saw you with a twisted and knotted shawl, writhed
it was a heart-stealing thing, my dear, it was not your body/attire]

To call a gāt 'heart-stealing' is an obvious, flimsy idea. To see her with a twisted and knotted shawl and writhe, is commonplace. By contrast, in Mir's verse there's not a single commonplace word, and the emotional level is entirely within his control.

Nur ul-Islam Muntazir has versified jhurmaṭ as feminine, but Mir has versified it as masculine, and this latter is also the customary form. In the farhang-e āṣifiyah it's written that in the east it's spoken as feminine, and this can be seen from Muntazir's verse too; but I haven't found any other example of the usage as feminine.

FWP:

SETS
MOTIFS == CLOTHING/NAKEDNESS; EROTIC SUGGESTION
NAMES
TERMS

Note for grammar fans: In the first line kyūñ-kih is not 'because'; here it is a variant form of kyūñ-kar , 'how', that has been shortened to suit the meter.