By Nakisha Williams
Updated December 18, 2012 at 05:05 AM EST
Ron P. Jaffe/CBS

How I Met Your Mother

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SPOILER ALERT: If you haven’t seen tonight’s episode of How I Met Your Mother (or read our full recap), stop reading now.

It was the moment HIMYM fans been waiting for! No, we didn’t meet the titular mother, I’m talking about the other moment we’ve all been waiting for.

Tonight we watched as Ted struggled to decide whether to tell Robin about what was really going on between Barney and Patrice. But at the end of the day, Robin got the answer — or rather the question — straight from the source. As snow began to fall on a candlelit rooftop, Barney finally (finally!) proposed to Robin. Series costume designer Reiko Kurumada told EW that it was such a big moment in the show’s history, she wanted to make sure the characters looked unforgettable.

“As as soon as I got the script, I had this vision of what I wanted Robin to be wearing. I really just wanted a classic, simple, gorgeous gown. I looked high and low, different department stores, different designers, and I couldn’t find the perfect gown,” Kurumada remembered. “We were getting down to the nitty gritty, so I decided to look on Monique Lhuillier’s website and there it was. That was the gown!”

Kurumada — who has made major changes to Robin’s wardrobe since taking over as head costume designer — didn’t want to distract from the character’s show-stopping red dress, so she accessorized the look with a pair of simple faux diamond Nadri earrings and an Alice + Olivia coat. “We did a bunch of alterations,” Kurumada said of getting the jacket just right. “Initially, it had a tie belt, but we took it off and tailored the back. It turned out to be exactly the vision of what we wanted.”

Of course, the ever-stylish Barney suits up for the big moment, donning Dolce & Gabbana and his classic Burberry overcoat. But this time he had a new trick up his sleeve. Kurumada revealed that actor Neil Patrick Harris actually helped find the the engagement ring his character proposed with. “The prop department showed Neil some options, and he picked the one he wanted. It’s not a real diamond, but it has a vintage look,” she told us. “Neil said he thought that Barney would have gone all out and spent $100,000 for that sucker, so they got a beautiful faux diamond ring.”

Although we’ve already gotten a sneak peek at Robin’s wedding gown, which is also from Monique Lhuillier, Kurumada said we’ll definitely get another glimpse of it in the near future. “You’ll see it again in an upcoming episode and then obviously, in the future, we’ll see the entire wedding,” she promised.

Read more:

‘How I Met Your Mother’ Recaps and Episode Guide

Robin, Ted and more ‘How I Met Your Mother’ characters get wardrobe makeovers — EXCLUSIVE

‘How I Met Your Mother’: On set with Neil Patrick Harris and Cobie Smulders — EXCLUSIVE

Episode Recaps

How I Met Your Mother

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