Not sure if this one's been posted, you can stream here
http://animeshow.tv/Nanatsu-no-Taizai-episode-10/
go to about 14:00
two girls are shrunk, one from giantess to normal size, the other from normal size to tiny.
Really good show, highly recommend it, the whole thing is up on netflix with english audio.
They do grow back to normal size a few episodes later, although the giantess growing is off camera