Cupressus nootkatensis 'Pendula'.

Formerly known as, and more readily searchable as Chamaecyparis nootkatensis 'Pendula'.

Someone else was asking about this plant last week, and brought up the fact that there's some variability in this selection, with certain plants being narrower than the one you've shown. I'll link his thread so you can get a look at this.

Alex

Here is a link that might be useful: recent C. nootkatensis 'Pendula' thread

Yes, due to multiple cultivars having been grown under the name you have to buy specimens of some size in order to have an idea if it will grow into something like what you are trying to match. And as with other kinds of trees younger ones can be less full than older ones for many years.