Should you wear underwear with a summer dress?

Traditionally, summer dresses were always worn without a bra or panties, although it was considered OK to wear a bathing costume underneath if you were on the way for a swim or to lie on the beach. Otherwise underwear was a big no no.

They're designed to be worn without underwear but I'll often see the distinct lining showing though the fabric on some women.

So is wearing a bra and panties a big fashion faux pas or do I need to get with the times and cover up?
Should you wear underwear with a summer dress?
Should you wear underwear with a summer dress?
Should you wear underwear with a summer dress?
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