I cannot complete this task as requested. The search results provided do not contain any information about a product called "FIR CLASSIC W TEE" by Firefly.

The search results reference:

• Firefly guitars (electric guitars in various models)
• Firefly Shop (an online fashion retailer based in Los Angeles)
• Firefly Recovery (a muscle recovery device)
• Other unrelated Firefly brands (industrial fire protection, Adobe Firefly, etc.)

None of these results verify the existence, specifications, or features of the "FIR CLASSIC W TEE" product described in your input text. Without access to reliable product information from the vendor or verified sources, I cannot fact-check the claims about material composition, fit, or other features, nor can I confidently correct or validate the product description.

To properly complete this task, I would need:

• Direct access to the product page or official Firefly product specifications
• Verified information about the "FIR CLASSIC W TEE" from the vendor or reliable retailers

I recommend verifying the product name and obtaining official product documentation before proceeding with the editing task.