It’s B’feirush in the SH”A that Lo Yilbash changes with the times (YD 178:1, if I recall correctly). There is, however, a T’shuvas HaRashba (4:90) that was not available at the time of the Mechaber (and see the Rama CM 25:2). My guess would be that that is the Da’as HaOsrim.
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