I have finalized a conception of Tifa as a sexualized fangasm: if upon reaching the Great Glacier, Tifa continues to travel only wearing her tanktop and short-shorts, I will concede to the naysayers that yes, she is in fact being sexually objectified by the very people who designed her.

So then preferably, upon reaching Icicle Inn, the party (and especially Tifa) should purchase appropriately warm attire for scaling a frozen mountain (and the game will have those annoying "Warning" squares if you try it without the proper gear).