Your fit looks good here.
The color saturation of the seersucker is really low and it reads as nearly white. So you've got a lot of leeway when picking colors. I would just steer away from near matching colors and patterns.
To me, colors that almost but don't quite match are the worst. A real pet peeve that drives me nuts.
The picture you posted looks good to me. The stripe color on the shorts is faint anyway, so anything goes.
I would recommend to never try to match colors unless they are sold together. The colors will never actually quit match and will look off. Just go with something that's obviously a different color. That could also mean the same color, just a way darker or lighter shade of that color.
You don't need to match; you need not to clash. A blue seersucker would look great with this as long as the blue in the seersucker doesn't clash with the blue of the shorts (it probably won't).
Seersucker says what?
