Our wedding is very casual. The BM are wearing like evening dresses.. with flats. My dress isnt very fancy... its nice but not extravagant. Now the GM's we are having a problem with. They are wearing white button up shirts with ties, and they insist on wearing their boots. Which im more than okay with

But the boots look tacky with black slacks?? Should we go with Black jeans? I dont want to go with dark blue jeans.. that would look out of place.. Any ideas??