<span class="x" onmousemove="Show('perush','Este es el <b>39no Precepto Negativo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">No vestirá la mujer hábito de hombre</span>, ni <span class="x" onmousemove="Show('perush','Este es el <b>40mo Precepto Negativo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">el hombre vestirá ropa de mujer</span>; porque abominación es á SEÑOR tu Dios cualquiera que esto hace.
Mishneh Torah, Foreign Worship and Customs of the Nations
A women shall not adorn herself with man's adornment, such as a mitre, or a helmet, or a coat of armor, and the like, or cut the hair of her head man-fashion; neither shall a man adorn himself with the adornment of a women, for instance to wear loud-colored garments or golden ornaments in a territory where such clothes are not in style for men to wear or where such ornaments are not put on by any save women, all depending on the custom of the land. A man who adorned himself with woman's ornaments, or a woman who adorned herself with man's ornaments, are striped. One who picks white hairs from his head or beard, after he had picked the first hair thereof is guilty and is striped, because he adorned himself with woman's ornaments. Likewise if he dyed his hair black, after he had dyed the first white hair he is guilty and is striped. A gynander, or androgyne is forbidden to either wrap his head like a woman or shave it man-fashion; but if he did either of the two he is not striped.13Nazir, 59a; Makkot, 20a; Shabbat, 94b; Tosefta, Bikkurim, Chapter, 2. C. G.
Rav Breisch then expands the definition of pain for which a doctor may injure. His source is the Gemara’s (Shabbat 50b) permission for a man to remove scabs from his body to eliminate pain, but not merely to beautify himself. Rashi (ad. loc. s.v. Mishum L’yafot) explains that removing scabs for beautification purposes is forbidden for a male because it is regarded as feminine behavior.5Halachah forbids both men and women from imitating the behaviors of the opposite gender; see Devarim 22:5 and Shulchan Aruch (Y.D. 182).Tosafot, however, (ad. loc. s.v. Bishvil) qualify the Gemara’s statement: “If the only pain that he suffers is that he is embarrassed to walk among people then it is permissible, because there is no greater pain than this.” Thus, Tosafot extend the definition of pain to include psychological distress. Accordingly, since the inability to find an appropriate spouse is certainly most distressing and the prohibition to wound does not apply when attempting to alleviate pain, Rav Breisch permits the young woman to undergo cosmetic surgery.