For both men and women:
1.I suggest that you wear your maroon blazer with a pair of black pants and a white T-shirt. The top should be a deep V-neck T-shirt.
Wear black shoes with this color combination.
2. You can combine the maroon blazer with a pair of maroon pants and a white shirt/blouse.
And Wear black shoes with this outfit
3. You can wear dark grey jeans and a black top (sweater/ T-shirt) with the blazer.
4. You can style the blazer with a grey top and grey jeans.
1.It is okay to combine the blazer with a beige top and the black pants.
Looks and Examples: