But, as they say, there's always an exception.
Recently, there have been a spate of postings and discussions on matters of women's modesty, tzni'ut. This includes MailJewish - a few postings are here and also here as well as here among many other entries along that thread there; and DovBear (here, for example or also here); and Hirhurim (here's one), for starters. You can go to forums like this one if the subject has, er, gripped you.
Anyway, I thought to myself if haircovering is a major discussion issue (and my wife has a chapter contribution in this book - Hide and Seek: Jewish Women and Hair Covering) - why not raise another issue of covering/uncovering.
The Shulchan Arukh, the major 16th centruy compilation of everyday law, deals with the matter of carrying on the Shabbat, which, unless certain restrictions are followed, is prohibited.
Chapter 303 deals with women walking about in the public domain with jewelry which is problematic.
May one wear jewelry?
Background: although jewelry and ornaments are not ‘clothing’ nevertheless they serve a function and wearing them on Shabbos is not considered carrying, provided that they are worn in the regular manner.  Chazal however were concerned that one would remove one’s jewelry to show to a friend and carry it in a reshus harabim (a public domain) and transgress the issur of carrying. They therefore prohibited wearing most jewelry.
Most jewelry and ornaments may be worn nowadays because the Rama writes  that women do not remove their jewelry to show their friends and therefore the major concern is removed. The explanation being that in former times pieces of jewelry were not common and women would wear them only on Shabbos, thus they would show their trinkets to friends. As jewelry is much more common nowadays and worn all the time, this no longer applies.
 Based on many se’ifim in simonim 310 and 303. See also SS”K 18:12.
 Simon 303:18.
 Bi’ur Halacha simon 303:18 ד"ה כי בזה, Shulchan Aruch HaRav simon 303:23, SS”K 18:12.
If, however, we delve a bit into the sources, we can find something interesting.
Here's the original Hebrew for sub-paragraph 10 of 303:-
שג דיני תכשיטי אשה
לא תצא בנזמי האף שמא תשלפם להראותם אבל יוצאת בנזמי האוזן מפני שאזניה מכוסות בקישוריה וטורח הוא לה לגלותן לשלוף מהן הנזמים להראותן ובמקומות שנוהגין לגלות האזנים אסורה לצאת גם בנזמי האוזן
A woman shall not go out [into the public domain] with nose rings for perhaps she may undo them to show them off; but to go out with earings [is permissable] because her ears are covered [my emphasis] with her ornaments and it would be too much of a bother to uncover them in order to slip them off for display; and in places where the ears [are in any case] uncovered, it would be then prohibited to walk about with earings.
As I am not a Rabbi, well, a diplomaed one, please, if you have any questions, consult your local Orthodox Rabbi but two observations:-
a) Jewish women had nose rings.
b) Jewish women seemingly had to cover not only their hair but their ears as well (only on Shabbat?)