ANSWER:

You must immediately straighthen the hijab and no need to pray it again. 

However from now on you must wear a very loose and thick outer garment that covers the entire body and that which does not expose the awrah while bowing or prostration. 

After praying my sunnah prayer after Maghreb I noticed that part of my hijab moved and my hijab became see through. I’m not sure if this happened during maghrib salah. Should I assume it did and re-pray Maghreb?

Prayer | February 22, 2019 11:16 am
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If a person forgets to bow in the fourth rakah of obligatory prayer & remembers it in the tashadud, then should he stand again & Complete the rakah, considering it as fourth or should he finish of his prayer & again pray the whole Salah? As bowing is one of the Arkan of the salah.