I've looked through this thread and not found this tip anywhere, so I thought it might be useful. I like tops that have see-through gauzy/lacy long sleeves (
not a great example, but it shows what I mean), but I find that my more recent scars tend to show through. What I've taken to doing is buying skin-coloured tights and cutting them up to make arm-bands that I wear underneath see-through sleeves. If someone looks really closely, they might be able tell that your arms are a bit darker than they should be, but no one does. :) I've spent whole evenings like this with close friends and no-one noticed a thing.
Also, seeing as prom/ball season might be coming up for some of us, I thought I'd draw attention to Oasis. They've brought out
black and
navy blue full-length dresses with long sleeves, and they're quite cheap for occasionwear. If anyone queries your choice, just say you fancied being a bit different, or that you know it gets cold in the evenings, or something like that.