Where do we buy clothes these days?

Help! 39F and need a new wardrobe. Key notes: - im an executive at a consulting company and also mom to a 3 y o and large dog - I work at home mostly but also travel quite a bit to corporate meetings with clients etc - I live in Ontario, Canada - I'm petite: 5'4" - I don't want to spend a fortune but am happy to invest in some nice pieces that can be arranged with multiple items and will last

Where does everyone shop? TIA