Salaam Sister ellenor and welcome!

you will be allowed to wear your wedding dress to the mosque sister, but I think you may have to wear something more moderate over that as it will be in a mosque, so you could put a large shawl or even a hijab on you or something

regarding bringing up children, i've not had any experience of interfaith marriages myself, but i think usually the children are brought up as Muslims, for muslims are usually far more serious about religion and on the husbands insistence or reccomendation, the wife usually agrees to bring them up as Muslims, and as i myself being convinced of the absolute truth of islam, i hope that your children will be raised as muslims too

ofcourse it will only be too right to teach them about their mothers religion, christianity too, but in terms of mixing up the practices of both religions, i think that will be confusing to the children, and also it will not be allowed from an Islamic point of view, for Islam, allthough it considers christianity to be originally revealed by God, but is of the view now that, 1, it is distorted [hence no longer representing the original chrisianity] and 2, that it is now invalidated too with the new revealed religion; Islam, that has been sent to all men

there is another thread about this issue sister; here is a link to it:

community.beliefnet.com/go/thread/view/5...(MuslimChristian)

I hope you will look indepth into Islam too sister, it is the natural continuation of the original christiantiy and judaism and having both parents of the same religion makes things so much easier for the children too

hope this helps

Salaam!