Photos: Hills Come Alive At Bryn Mawr Film

Girls in white dresses with blue satin sashes, snowflakes that stay on one's nose and eyelashes, brown paper packages tied up with string: these are just a few of the things that made appearances at Bryn Mawr Film Institute on Thursday night. A sold-out theater of all ages gathered for the fourth annual Sound of Music sing-along, which has become something of a winter holiday tradition at the film institute.

The theater hosts about five sing-alongs a year, and the Sound of Music sing-along, which recurs each year, is by far the best attended.

And of course, dressing up is half the fun.

"The costumes for sing-alongs like tend to be more literal, but with Sound of Music, they get to be more creative," BMFI Public Relations Manager Devin Wachs said.

Check out the photo gallery above for a look at some of the costumes, including nuns (both male and female), brown paper packages, curtain dresses and snowflakes.

Challenge: Can you name all the Sound of Music references in the photo gallery? Can you spot for BMFI's Wizard of Oz sing-along?