When you get the dress, you need to give it to Laura, then go grab the acid and when you do get it, just head to Laura room, I believe on Friday evening, don't enter her room in the morning, you should see the option to select the dress. Once you do you will automatically ruin it.Hm... any idea how to ruin the sister's dress with acid? I finally bought the dress.. went to the workshop, even decided to work there.. but the option to use acid on dress never shows up.
repeat it another 3-4 times and the part should be completed.
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