A great white T-shirt is key for a spring and summer wardrobe. In the spring, wear it under a blazer or jean jacket with a scarf (check out the budget friendly scarf on my my last: 5 Key Pieces For Spring), and in the summer it works with a maxi skirt or shorts.
Splendid V-Neck T-Shirt. I love the T-shirts by Splendid because they are super soft and hold up to multiple washings. This one looks like you borrowed it from your guy, but it is cut for a woman. And the neckline is perfect: not too high or too low. It comes in black as well. Free shipping and free returns. $48