Hi Chevy,
a nice pantsuit is fine, not only for informal night but also for formal night.
Capri pants with a nice shirt or blouse is fine for casual evenings.
Hip at the moment for the evening are the little more elegant Flip-Flops (hope its the same name, than here in germany). So I did not ware evening shoes with my capris or my pantsuit.
Hope, this helps your wife.
Marita
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