Custom fabric printing- 300 or 150 DPI?

I'm planning to order a custom printed superhero-esque body suit. The design I made has lots of fine details so I'm concerned about it getting overly compressed. I read that 300 DPI is best for printing so I made the whole thing in GIMP on a 300 DPI canvas, but I've run in to an issue that the printing service I want to use only accepts 150 DPI files. I'm finding conflicting information that maybe 300 DPI is actually too high to resolve on fabric so 150 is better. Can anyone with experience chime in?