What color is your “collar?” (Elementary)

Lucy asks Li Hua to go shopping, but she doesn’t seem to want to go. Why? Let’s look at the following conversation.             Zánmen qù mǎi yīfu ba! Lucy:咱们     去  买  衣服 吧!

             Let’s go shopping for some clothes!

             Wǒ búqù, wǒ méiqián le. Li Hua:我   …