To be perfectly honest, if drivers can't see you in your current state the only option is a hump rucksack cover. Sorry.
but this guy could only see my front (if he'd bothered to look in his mirror) so unless I wear it on my head or like a Cameo pouch then it's of no real use
You should've been in primary, waiting in the traffic jam. Only yourself to blame.
Second chance to notice the sarcasm