A looooong time ago when I was a member of the Compuserve Diabetes Forum… they were having just this discussion. I’d been diabetic a long time and always injected in private, but was only doing two injections a day at that point if I recall correctly.
When I switched to more injections… something inside my brain went EEEEEENGH, and Stuart started going through clothes (clean clothes btw)… had needles bend on both pen & the normal syringes with or without clothing… iron skin
Only time it gets remotely messy is if it hits a capillary, vein, then you get droplets of red… well ok, going through flannel in winter can be interesting too but ; ) a little planning and a button or two… no problems at all injecting through clothing…
My dry cleaner sometimes loves me, sometimes hates me depends on the month