All segments of the Church - Catholic, Protestant, evangelical, etc. - and their adherents do things "not backed up with scripture and man made", as do other Faiths. These things usually relate to some attempt, however misplaced, to show piety, however unsupported by any scripture or divorced from a scripture's original meaning. The more close-knit and insular a community, the more interplay (and confusion) generally exists between religious doctrine and secular norms and practices. These displays of piety may be a good thing, a bad thing or a mixed blessing. As Capdon noted, there is usually no harm and, really, no one else's business.
Mennonites and Amish do not wear mustaches because they were a sign, in 16th-18th Century Europe, of a military man, and those sects are pacifistic. Beards, on the other hand, are grown by all married men within those communities because of an admonition in Leviticus that referred to certain "heathen" practices involving trimming the hair and beard in particular ways to honor their gods. Um, like...
Anyway...
(Similarly, the Jewish dietary prohibition against mixing meat and milk products like cheese derives from a scriptural warning about "boiling a calf in its mother's milk" - something else that was apparently done as a religious ceremony by some non-Jews in that time and place.)
Catholic practices to show piety, whether church required, church sanctioned or just tolerated by the church, have got to be the most numerous and varied - due, I think, in large part to the Church's teaching concerning continuing revelation. Where Tradition is considered to be of coequal authority with Scripture, there is almost limitless room for "new rules" to crop up. And crop up, through the centuries, they have.