The MIDI (skirt or dress)
NOTE: I don't have links for where I found these pictures, but feel free to use https://www.google.ca/imghp?hl=en&tab=ii to find where I got these... They come from all around the web...
The pencil midi (and stripes, another great trend)
The flowy midi
The denim midi
Midi skirt with buttons (full-button skirts, another great thing)
The midi dress (again, LOVE the stripes)
The peasant midi (I doubt this look is trendy, but it sure is cute!)
High-waisted midi, and pleated too!
The casual midi