Responsa for Shabbat 124:15
ומהדר אפיה לפורייה נמי לא אמרן אלא לארעא אבל במנא לית לן בה
But whatever provides both enjoyment and rejoicings, the Rabbis forbade; but that which is a luxury but not associated with rejoicing, the Rabbis did not forbid.
Teshuvot Maharam
Q. May a person attach a metal buckle to his girdle as an ornament, and then file the buckle into the shape of a key with which he can unlock the door of his house, and then wear this buckle on the Sabbath?
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
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