Riding gear isn't very practical over business casual attire. Any suggestions?
For trousers, check out Cycle Gear "Ironworker" cargo pants or jeans.
Kevlar-reinforced, crashworthy with knee padding.
Took a 60 mph slider (oncoming delivery truck forced me toward the shoulder; re-gaining the roadway, front knobby washed out on the hard-surfaced road and I went down left side, sliding about 60 feet). No damage to yours truly, seamstress patched small rip in aforementioned cargo pants.
Happy Trails Paris-Dakar nerfs, Tusk handguards with spoilers did their job (Generation 1), smashed left rear-view mirror.
SIDI Adventure Rain Boots earned their keep; Arai motocross helmet scratched minimally. Quality motorcycle-specific gloves protected my hands and fingers. Good ol' Technic motorcycle jacket (not its first rodeo) only acquired some more "character" rips and tears.
ATGATT paid off.
Just a comment on boots; not my first crash with the SIDIs. Dug deep to pay for these costly stomps, intrigued by the ankle hinge; stabilizes the joint under such trauma; ankle hinges also found on high-end motocross boots. Previous crashes, wearing motocross boots WITHOUT ankle hinge construction, I've walked with a colorful limp for a long time after similar lay-downs. Never yet a toe/foot/ankle/leg injury while wearing the SIDIs in a crash (knocks on wood).
I'd recommend buying the boot with the best protection you can afford; your extremities, your budget!
DISCLAIMER: To everything above, YMMV!