Vests for groom as a solution to tailoring issue during Covid?

I was hoping to get opinions on the look of a groom and groomsmen in vests instead of jackets/suits? I had my heart set on getting my fiance a custom tailored dark gray suit, white shirt, and black tie (groomsmen in black with gray ties, probably rental suits). FH is a bodybuilder with 20in arms, so there is no off the rack suit that is going to fit him. I am getting nervous about our timeline and being able to actually get him a properly tailored suit with most stores still shut down here in Colorado. Our wedding is September 6th. I am altering my dress (tons of experience in historical costuming and corsetry) and have toyed with the idea of trying to help him, but I am terrified of men's suit tailoring, which I feel is on a completely different level. Anyway, I wanted to see how people feel about vests in general as stand-alone for guys. Way easier to fit, probably saves money in the end, but a much more casual look. Is it a good look or is it cheesy? Does anyone have other ideas for men's attire that is easier to fit or customize?