By Patrick Gomez
Updated May 17, 2015 05:25 PM
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Elisabeth Caren; Frank Ockenfels 3/AMC

All good things must come to an end – and that cliché extends to great things like Mad Men.

“The last day of shooting was so sad,” costume designer Janie Bryant tells PEOPLE of being on set for the last day of filming the AMC drama’s seventhand final – season. “The whole entire cast showed up on set. And, with each actor wrapping their last scene, everyone was just crying like crazy.”

“We were all there and applauding. All of the actors were saying their farewell speeches. And [the show’s creator Matthew Weiner] was there saying his farewell speech to them. And then we had this huge group photo,” continues Bryant, an Emmy winner for her work on HBO’s Deadwood. “It’s hard for me to think about it and not get teary-eyed.”

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Bryant was responsible for the show’s iconic looks for eight years and says the actors and crew considered each other “family.”

“It’s almost hard to emotionally register it because it is such a bittersweet thing, having this huge journey and growing together professionally. It is such a big thing,” says Bryant, who is designing the uniforms for the newly renovated Watergate Hotel and launches her Black Halo capsule collection in July. “We spent so much time together and we had so many close relationships that I feel like those people will always be my friends.”

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The final episode of Mad Men airs Sunday at 10 p.m. ET on AMC.