Consumer protection acts are provincial laws. Therefore, any concerns about consumer rights should be referred to provincial authorities and appointed provincial consumer affairs offices:
Consumer Services Bureau, https://www.ontario.ca/page/ministry-government-and-consumer-services
Office de la protection du consommateur, www.opc.gouv.qc.ca
Alberta Government Services, Consumer Services Branch,
Business Practices and Consumer Protection Authority of British Columbia, https://www.consumerprotectionbc.ca/
In general, every seller has a different return policy. The return policy is often stated on the back of the receipt and/or posted near the cash register. If it is not, it should be requested in writing on the receipt. Note that these policies may change during promotions and for items that are on sale or are deemed to be "party wear." A restocking fee may be charged.
Some stores will allow the goods to be brought back, but only under set conditions. For example:
It is always advisable to keep the sales receipt. Although this is almost always required, some stores will issue a refund or perform an exchange without a receipt.