There is no such an evidence, either by the Hellenic, or the Hebrew text of the Book of Esther, that the King asked her to appear naked in front of the guests.
In fact the ancient Hellenic text shows that: He asked the servants to introduce the Queen to the Lords of the Nations, wearing her Crown and show her magnitude & beauty.
You can only show your magnitude only if you have your royal clothes on....
?ν δ? τ? ?μ?ρ? τ? ?βδ?μ? ?δ?ως γεν?μενος ? βασιλε?ς ε?πε τ? ?μ?ν κα? Βαζ?ν κα? Θ?ρ? κα? Βαραζ? κα? Ζαθολθ? κα? ?βαταζ? κα? Θαραβ?, το?ς ?πτ? ε?νο?χοις το?ς διακ?νοις το? βασιλ?ως ?ρταξ?ρξου,ε?σαγαγε?ν τ?ν βασ?λισσαν πρ?ς α?τ?ν, βασιλε?ειν α?τ?ν κα? περιθε?ναι α?τ? τ? δι?δημα κα? δε?ξαι το?ς ?ρχουσι κα? το?ς ?θνεσι τ? κ?λλος α?τ?ς, ?τι καλ? ?ν.