It seems like you're looking for a yellow plain round neck T-shirt. If you're looking to purchase one, you might want to check various online and offline retailers, as well as clothing brands, to find the specific style and fit you prefer. Many popular clothing brands and online marketplaces offer a variety of T-shirts in different colors, including yellow.
If you're asking for information or advice on where to find such a T-shirt, please provide more details such as your location or any specific preferences you have, and I can offer more tailored recommendations.