I have written earlier about nude baptism being the standard of the early church, and that the office of deaconess was orginially tied in with the responsibility to minister to female baptizands; it turns out that this practice was actually inherited from the Jews.

I quote here Gill's comments on Matthew 23:15 (note that, being a Whelmist, he is reluctant to transliterate the word in question):

The Ethiopic version reads the words, "baptize one proselyte, and when he is baptized"; referring to a custom among the Jews, who baptized; or dipped their proselytes in water, as well as circumcised them; about which there are great disputes in their writings; some alleging, that the dipping of them was necessary to the making them proselytes . . when he is healed [from the circumcism] they immediately dip him; and two disciples of the wise men stand over him, and acquaint him with some of the light commands, and some of the heavy commands; then he dips, and comes up, and is as an Israelite in all respects: if a woman, the women set her in water up to her neck, and two disciples of the wise men stand by her without, and inform her of some of the light commands, and some of the heavy commands.''

"Says R. Eliezer, in the name of R. Jose ben Zimra, if all that come into the world were gathered together to create even one fly, they would not be able to put breath into it: but you will object what he saith, "the souls they made in Haran", Gen_12:5, but these are the proselytes whom Abraham proselyted; but why does he say "made", and not proselyted? to teach thee, that whoever brings near a stranger, and proselytes him, "is as if he created him". You will say Abraham made proselytes, but not Sarah: the text is, "the souls which they made in Haran": which he made is not written, but which they made: Abraham proselyted the men, and Sarah proselyted the women.''

So we can see that even in Jewish culture, baptizing was in the nude, and special considerations had to be given when women were being so baptized. This separate practiced was inherited by the Christian community.