hello and welcome!
The choice of your first kilt and tartan is YOURS, not the inlaws , or indeed anyone else,you may go down that road, but realistically a kilt is a substantial investment for you, and it should be something you would be happy to wear.In traditional Scottish weddings there will be a variety of tartans, if they were all the same it would be either a uniform, or something from the hire shop.
It's a good idea to speak to the pipe band, let us know how that works out.
There are many people on here in the UK who are likely to be able to advise you on where to go to find a good kilt maker
.
This has just crossed with Matt's message, I'm happy to help you find a tartan weaver or maker , as I;m in the UK