I was lucky enough to be the recipient of some free dresses from a friend of mine. They didn't fit her anymore. They fit me, but I am significantly shorter than she is. So hemming was definitely going to have to happen (story of my life).
The second sundress I haven't attempted to hem yet. It's current length is roughly 6" too long for me and will require cutting to get it knee-length on me. I'm hesitant to cut into it because I'm concerned about cutting the new bottom edge evenly. Not sure how I'm going to do it. Here's the original length and what it will look like after hemming - I pinned it up a little haphazardly to get a feel for the new length.
The third sundress I managed to not take any pictures of. I will remedy that once it's dry (washed after hemming). It's a halter top style, blue flower fabric. The length was similar to the plaid dress. I only had to take it up 2" so I used the same strategy of simply folding it up, topstitching the new hem, and catch-stitching the excess.
The fourth and last dress I was given is very different. It's a shirt dress in an eye-catching light teal and brown colour combo. It has a self fabric belt that disappears into the dress. Besides that it also needs hemming, but not too much I think. I'm going back and forth on whether I like it since the fabric isn't a pattern I would have bought for myself for a dress. Plus I've never owned a shirt dress before. I think I'm going to keep my eye out for a wide dark brown belt to pair with it. I think that would ground the pattern a bit more.
So out of those 4 dresses, 2 are hemmed so far. Two to go.