Just to emphasize what the author at Mahapashupatastra.blogspot.com has cited as reference from 'Rama Rahasya Upanishad' to show Srimathi Sita Devi to be none other than Sri Lalitha Tripura Sundari (Kamakshi):

The next verse speaks about Sita Devi as follows.

"raamaabhiraamaa.n saundaryasiimaa.n somaavata.nsikaam.h
paashaa~NkushadhanurbaaNadharaa.n dhyaayettrilochanaam.h " (Rama Rahasya Upanishad Ch 2, Verse 33)
"I worship the three eyed one, Who is Abhirama, the pinnacle of beauty,
Who wears the crescent as ear ring, And who holds the noose, the goad, the bow and the arrow".

...Sita is called as the one holding noose (pasha), Goad (Ankusha), bow (Dhanush), Arrow (Baanam). What can be a greater proof of Sita being equated with Lalita better than this verse?.