Is wearing a padded bra once in a while acceptable when fancier clothing doesn't fit right in the bust?

I have a pear shaped body. On a regular t shirt day I don't bother wearing a bra. However fancier clothing like blouses and dresses do not fit and hang loose in the chest and look sloppy.

I'm told padded bras are false advertising but I don't want to not wear cute clothes when dressing up.

Is wearing a padded bra once in a while acceptable when fancier clothing doesn't fit right in the bust?
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