If I receive an item from a company, buy something with press discount or was given store credit to purchase an item, I will put an asterisk (*) next to the item.
In posts where I may have received more than one item, instead of an asterisk (*), I may write ‘contains PR samples’ as a disclaimer at the end of the post.
I would never blog about a brand or an item that I wouldn’t wear/use myself or say something positive about an item that I am not in love with.
If a post has been sponsored, I will mention it in the post itself, usually in the form of a disclaimer at the bottom of the post. I refuse to say an entire post is not sponsored/collaborated when it has been.