I have recently graduated college (sad), so I know the stress of finishing the perfect dress for photos, ceremonies, parties, etc. Since these dresses are typically white across the board, I have found some of my favorite white dresses to wear under your cap and gown. These range in price, style, and formality so you can find your perfect dress.
I have linked all of the dresses shown in the header photo. If you are looking for more dresses, there are more linked in my LIKEtoKNOW.it.

Revolve Amanda Uprichard Dress

Alice + Olivia Tuxedo Mini Dress

Revolve For Love & Lemons Sunbeam Dress

Nordstrom Endless Rose Eyelet Dress

Shopbop Free People Shirt Dress

Anthropologie Satin Midi Dress