Josh, the executives of Google and Apple are not “royalty”. Do you daven in casual clothes? Maybe I shouldn’t ask.
Would the Queen of England wear denim? Would the former Ms. Middleton, now Princess Kate, wear it?
The world, not that long ago, wore hats, jackets and ties as standard formal-wear. That’s what anyone looked like on their typical commute home from work. Forget royalty. Look at old pictures; it is plain to see.
Even today, some sections of society still do wear dress coats and hats, such as the armed forces. Are they more regal than you, a ben melech?
What if the world switched to bathing attire, or none at all? Would that standard also apply to us, when Chaza”L tell us that Hashem despises nothing more than those who are holchim arumim like anshei barbaria?
Nor, for that matter, are even our Presidents considered the benchmark for royalty, though some are closer than others. Take any recent (or current) President and a Yeshiva guy in Hat and suit, and put the two in front of the Queen of England and her husband. To the eyes of someone who does not know any of the three, the one who would look least like they belong is the POTUS.
In truth, we are binei and binos milachim, regardless of how the world dresses. (And your implied disdain for Kollel/Chinuch life is wholly irrelevant to this topic. )