1 Tim 2:9 should not be divorced from V10, so let me quote both (BSB):
Likewise, I want the women to adorn themselves with respectable
apparel, with modesty, and with self-control, not with braided hair or
gold or pearls or expensive clothes, but with good deeds, as is proper
for women who profess to worship God.
This text gives me the impression that any woman who could afford it, dressed to impress (much as today!) Paul is simply encouraging women to lift their focus away from the type of apparel that draws attention to oneself and direct it to Christ.
That is, Paul wanted women to be known, not for their exquisite dress sense, but for their good deeds; or more precisely in the words of Matthew 5:16:
In the same way, let your light shine before others, that they may see
your good deeds and glorify your Father in heaven.
Christians should conduct themselves in such a way that even unbelievers give glory to God. This is not done by wearing clothes that bring glory to the person.
Lastly and specifically about braided hair: I do not believe that Paul was specifically opposed to braided hair but the braids containing gold or pearls. Gold threads cannot be placed in the hair without braiding it. Similarly, Pearls in the hair could only be done using braids. For a woman having long hair (as Paul in other places recommended, 1 Cor 11:15), braiding hair is and was a practical way to wear it in public.
Therefore, I suggest that Paul is not against braided as such, but against braiding hair with gold and pearls as an exercise in self glorification.