My suggestion is to have her pick the outfit she'll wear the following day, the night before, from 2-3 choices that you provide to her. (In other words, not just anything in her whole closet, but a few choices you feel would be appropriate based on the following day's activities and weather.) That way, if she isn't much of a morning person, at least you have the clothing choice decided the night before.
That having been said, a child should never receive what they wanted as the result of a tantrum. That is a slippery slope, mama. Because your daughter threw a fit and got what she wanted today, this will happen again. In general, it's best to set up a small child's life so you don't have to pick many battles, but the battles you pick, you win, period. If you'll be leaving the house, she does need to understand that getting dressed is not optional.