Scars on wrists can often be covered by bracelets or watches. For scars on arms long-sleeves are the obvious option, but there are other choices.. In the summer when it is hot you might prefer a vest top with an open shirt so that your arms are still covered.
Another option is to wear the sort of elasticated bandage that people use for sprains, or tubi-grip bandages. This means you can still wear short sleeves and cover your scars in a way that other people won’t be too curious about.
For scars on legs jeans, trousers, long skirts and tights can be worn. Some people might suggest that you’d be cooler in the summer wearlng less, so be prepared for such queries.
Covering up in general, ensures that you’re in control of who knows, and who talks to you about SI, but if you do show your scars, you will find that attention is given to them, so consider how you feel about that.