3. Tiny insects (less likely, but possible) 🐜
Examples:
Plant lice
Springtails
Clues it’s insects:
They move
Some jump when disturbed
Not strongly attached to fabric
If they were not moving, this probably isn’t it.
4. Ticks 🕷️ (IMPORTANT BUT UNLIKELY IF “ALL OVER”)
Do not usually appear in large numbers on clothing
Are darker, rounder, and slow-moving
Prefer climbing upward toward skin
If these were:
Numerous
Small and seed-like
Easily brushed off
(If you’re worried about ticks specifically, say so — I’ll walk you through a quick safety check.)
5. Urban weirdos (rare but real)
Things like:
Burrs from landscaping plants
Industrial fiber fragments
Velcro-like seed husks used in erosion control
Seen near construction sites or maintained paths.
Bottom line (without a photo):
99% chance these were plant burrs / hitchhiker seeds — totally harmless, extremely common, and designed to do exactly what they did to your pants.