I would like to quote a verse that addresses this question. You will see that it specifically mentions WOMEN but we can certainly apply it to MEN as well. I’m speaking of 1st Timothy 2:9-10, “In like manner also, that women ADORN THEMSELVES IN MODEST APPAREL, with propriety and MODERATION, NOT WITH braided hair or GOLD OR PEARLS OR COSTLY CLOTHING, but, which is proper for women professing godliness, with GOOD WORKS” (NKJV). These words are simple; a Christian should wear “modest apparel” in “moderation” and should not be decked out with “gaudy jewelry” and “costly clothing.” The word “modest” means a Christian should wear clothes that are “decent” so they don’t draw attention to parts of their body in order to arouse those of the opposite sex. The word also, along with “moderation,” means their clothing should be “simple” and “appropriate,” which teaches us our clothing should be “in good taste.” We should avoid extremes in dress; that is, we shouldn’t dress with the most outlandish fashions of the day, nor should we dress in tattered clothes (unless that’s all we have). In both cases we would be drawing attention to ourselves in order to be popular.

You also mentioned “all sorts of jewels” and this passage makes it crystal-clear that a Christian should not be adorning themselves with “costly jewels.” In both cases (clothes and jewelry) a Christian should be more concerned about their “inner character” (godliness) being on display through “good works” rather than their “outward adornment.”

In closing, when a Christian does conform to the world by wearing indecent and costly clothes and jewelry, they are falling into the snare of the devil, which is PRIDE. We read about this in Ezekiel 28:15 & 17, “You were perfect in your ways from the day you were created, till iniquity was found in you…YOUR HEART WAS LIFTED UP BECAUSE OF YOUR BEAUTY; You corrupted your wisdom for the sake of your splendor.” Whenever we become focused on “outward beauty” our hearts, like the Devil’s, become lifted up with pride. I once heard a traveling preacher give a message on “pride” and he said there are usually four types: 1) the pride of FACE (our natural beauty); 2) pride of PLACE (where we were born and where we live); 3) pride of LACE (this is the pride we’ve been speaking of where we take “pride in our clothes”); and 4) pride of GRACE. I must say that the worst of kind of pride is the last one, for if we find ourselves boasting because we are saved (as if we were so special we deserved to be saved), we have truly forgotten the meaning of GRACE. Grace means, “Undeserved favor.” We did NOT DESERVE to be chosen of God and saved; yet by His amazing grace we were! Let us never forget that. (334.1) (DO)