I’m in RAYNET & 4×4 Response.
I have a HiVis jacket (no faux batternburg squares and it’s red) as we have to wear them when out on a call but beyond that: no stickers, no flashing lights (unless you count the indicators ;-).
There are some, not in the group I’m in thankfully, who do seem to think they need to be lit up like a Christmas tree which makes me chuckle.
I was at one point sporting a stack of antenna on the roof (PMR, VHF/UHF, HF and Radio 4) but a fat pheasant took two out which set me back over £100 I didn’t want to spend esp as I was at the time driving the dog back from the vets from a 3 day stay. Expensive day that. I now remove them and cap the base mounts and only install them when called out.
I do though think I’m missing a trick and will buy a knock-off pair of aviator glasses and some stickers…