Miranda Lambert has become a fashion plate in the country world. At every awards show, she is certainly "one to watch," as fans are always curious what she will don. The singer will appear on Thursday's (Feb. 21) episode of the long-running fashion/design reality show 'Project Runway,' where the designers have been tasked to create an outfit for Lambert to wear.

She will choose the winning design, and in this preview clip, the 'Fastest Girl in Town' gets honest, offering her unabashed opinion about a slinky, strapless gray dress that has been created just for her. "I don't know that the fabric on me would be super forgiving," Lambert admits, clearly understanding what works -- and what doesn't -- for her enviably curvy figure.

"It doesn't look like I could squeeze a Spanx under that very easily," she points out.

Since she would have to wear it, it's smart for her not to pull any punches or to be too polite when critiquing the dress.

However, co-judge and model Heidi Klum liked it, since it had no seams. So did fashion editor Nina Garcia, who said, "It has the support. It's clean. It's elegant. With your curves, you're going to rock this dress."

Lambert -- who already looked hot with her blonde hair slicked back into a sleek ponytail and who was busty in a leather top -- was somewhat swayed by the fashionistas. "Well, hell, let's do it," she tells them. So, she might very well choose that dress. Or not. You never know on 'Project Runway.'

Miranda Lambert's 'Runway' episode airs at 9PM ET on Lifetime.

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