Hi, "was wearing" doesn't show the act of wearing the dress. It shows that she had the dress on during the party. That's a period during which she was wearing it.
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rpshif you use the continuous tense, you just say that she was doing the wearingYes. But the wearing of the dress is the fact that she had it on, not that she put it on.
rpshSo, if I say that she wears a really nice dress, does it imply that I emphasize on the result, while 'be wearing' indicates that I emphasize on the activity?No, "she wears" is general, means she usually wear that whereas "she is wearing or was wearing" refers to a specific period.
rpshSo, if I say that she wears a really nice dress, does it imply that I emphasizeYes. More or less. But it gets tricky. If you want a complete coherent sentence in isolation, you need something likeonthe result, while 'be wearing' indicates that I emphasizeonthe activity?