Idioms & Expression - "bathing suit with a little nubble all over it"?

river

New member
Hi, I'm an ESL student. What does the above phrase exactly mean? I would provide a context in the below.

She had on a kind of dirth-pink bathing suit with a little nubble all over it and, what got me, the straps were down. -from John Updike's A&P-

Thanks in advance!!!
 
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