Blue suit and green ties??

Our colors are dark blue, sage, and white. The bridesmaids are wearing sage dresses and the groomsmen are wearing dark blue suits (not as dark as navy but not a bright/light blue either.) When I first told my FH that I wanted the guys to wear blue he was a little hesitant because he couldn't see them working well together. He spent a lot of time on Pinterest looking at the color combination and he now sees the vision lol I personally think navy and emerald would look great together. I also think it's very considerate of you to think about the groomsmen in all of this. You are not being ridiculous because I would be thinking the same way. You said your fiance's friend already purchased his suit. Is it possible to see that next to the emerald color you're thinking so that you can get a good idea of what it will look like?

I think this would only work if the suits are a true dark navy. A lighter navy with emerald green would look very strange, in my opinion. I also, however, don't think you should be making your wedding attire decisions based off your friends being able to reuse suits. They agreed to be a part of your wedding knowing the costs associated with that. If you find a black or grey suit that you want the GM to wear, then they can buy or rent it. Don't settle because you feel bad.

Glad I could help! I'm sure whatever you end up choosing will look wonderful...good luck!

I think its super considerate of you to consider the cost to your friends and wedding party for attending and participating in both weddings. However, you shouldn't be the one to "lose out" if the colors don't work the way you envision them.

I did a quick Google search and found a few images of "emerald green and navy blue". This is what it looks like:

If you like the look, go for it. If you don't, I don't think you should feel like you need to compromise just so everyone saves money. Your fiances friend will have plenty of opportunities to wear a navy suit in the future. They didn't consult you about colors when they were choosing the aesthetic for their wedding, so I don't feel like you need to be the overly courteous one here.

If you don't like the navy/green combo but still want to be considerate of the expense of those who are in both weddings, maybe at least consider if you like the look of emerald green with gray suits and brown belt/shoes. Typically navy is paired with brown (navy with a black belt and shoes really doesn't look right IMO, see the first photo) and black is typically paired with black, but gray can go either way, so if you put your guys in gray suits then at least those in both weddings will have belts/shoes they can use for both.

In the photos above, I personally don't like the navy suits, black shoes, green dresses combo in the first photo, but feel like the navy suits, brown shoes, and green dresses in the second (note that is a photo collage) and third weddings looks good. It's what you and your FH want!