Girls Suit

Girls’ Casual Short Sleeve Top

Other good options:

• Girls’ Everyday Short Sleeve Top
• Girls’ Cute Short Sleeve Shirt
• Girls’ Casual Summer Top
• Girls’ Classic Short Sleeve Tee
• Girls’ Comfy Short Sleeve Top
• Girls’ Everyday Casual Shirt

For Bunny & Bean, I'd choose “Girls’ Casual Short Sleeve Top” — it sounds clean and professional on a product page.