CF Dress Regs? That's why Google was invented...
The following are the different categories of naval uniforms in Canada:
Ceremonial Dress - 1
No. 1 - Navy blue uniform with medals, swords, etc.
No. 1A - Navy blue uniform with medals only
No. 1C - White high-collar uniform, with medals
No. 1D - White high-collar uniform, with ribbons only