Groom's Party Attire

If it's all picked then what's there to be serious about? All it would be is a try on.

We just went to mens wearhouse (FH and I) and picked out the outfit for them to wear, they made a group and emailed all of the guys with the link to rent their stuff! Easy peasy, we will check in close to the rent-by date to make sure everyone gets theirs, but they are adults so we are just letting them handle it besides telling them what to get!

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The colors are picked, and the attire has been discussed, but we want them to be comfortable, and none of them are good at communicating what they like and don't like. They don't really care, and I can't pick what's comfortable for them, and don't want them to spend a bunch of money on an outfit that they hate, will never wear again, and still have to wear all day to my wedding.

Honestly if they can't take it seriously that's on them not you. Like you said you can't figure out someone else's comfort. If they okay they have to suck it up and wear it.
You could also take them one on one but I'm not sure how that's go schedule wise.

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I haven't looked at MW just yet, so we'll have to see what they have Half the party can take care of themselves, the other half are younger and needs some help

I mean this in the nicest way possible, but: if they don’t care, they don’t care. It’s nice that your primary concern is their comfort but it seems like maybe what is *most* comfortable to them is actually simply being told what to wear, ya know? Sounds like they’d be happier in what you choose than in something that may be more physically comfortable to them that something they actually need to be involved in. ( now if you make a choice and then the start complaining feel free to kick ‘em where it counts ). Many guys just don’t care and no need to turn it into a thing. My husband picked out his attire literally all by himself. Once he was settled, he texted the boys, told them what vest and pants to get (then any white shirt, we’ll provide ties, and any shoes in this style) .

Actually the shoes may be the most telling example: H didn’t want to make them buy anything but found a cheap pair of shoes he liked and bought for himself to wear. He gave the boys specific parameters and kind of presumed they’d each simply come with the closest thing they could find in their closets (totally fine, more or less the idea). Well, he also sent the link to the specific pair he bought to say “something in a style like this, doesn’t have to be the same” ....lo and behold 3 out of the 4 of them went ahead and bought the exact same pair of shoes. We were like “you didn’t need to do that!!!” and said basically the same as you— we just wanted you comfortable! I later came to realize one of the guys already owned a VERY similar shoe , like down to the color. I tried asking him why he didn’t just wear those !! He was like “eh, I KNEW the ones your husband was wearing would work well, so I figured why not?” Haha 🤷🏻‍♀️🤦🏻‍♀️. We try, irs the best we can do hahah.

I would just have you and your FI pick, then tell the guys what to order. Most men in my experience don't care and just want to be told - they dont' like the "shopping" part of it.