I've done part in person, part via email. Are you worried about something in particular? If you don't need any changes made to your pattern and you know what fabric you want, I don't see it being a problem at all.
One thing I forgot to mention, and it bodes well for ordering on e-mail: I ordered a couple of shirts from Chain using e-mail, and the shirts arrived in less than a month. Contrast that with ordering on one of the tours, where the wait is around three months.