I'm not convinced that drivers notice you any better if you're wearing dayglo versus any light colour. There's an argument that the human brain (especially in built up areas) now largely filters out dayglo colours as non-noteworthy ever since everyone from postmen to parcel deliverymen to bus drivers started wearing a hi viz vest years ago. About the only time your clothing is a bad choice is if you go out in dark clothing at night with no lights on.
I had the orange
Altura jacket so I think I know the material, I'm not sure that can be dyed effectively.
I'd say continue to wear and enjoy your jacket. Or treat yourself to a new one in the same size?
Edit:
A car hit me last winter. Drove into me, low speed, no damage done.
I was wearing a nearly new dayglo jacket, had two lights on the front and was riding a bright yellow bike.
Good point by Darius, wearing my neon orange Altura I had the nearest of near misses when a van pulled out on me from a side road as I rode towards him. I challenged him at the next lights and guess what... he didn't see me.
Your dayglo won't ever make up for a driver who isn't looking.