What are regulations and where do they come from? (Privy Council Office) The constitution determines the level of jurisdiction responsible - federal or provincial
Permits, licences and regulations
Industry Canada - Information by industrial category e.g. Consumer Products - note Regulations and Standards in sidebar
Canlii - the advanced search (Canadian Legal Information Institue) Provides full text of statutes and regulations
Industry and trade associations can monitor legislation/regulatory developments for their members - so one strategy is to look for an industry association either by consulting a resource such as Canada's Information Resource Centre or Associations Unlimited or by doing a Google search such as clothing manufacturers associations.
In this case it leads to a listing one of which is Associations directory for the apparel and fashion industry.
From here there is a link to the American Apparel & Footwear Association. Note the link at the top to AAFA on the Issues.