Bloomer

What's more, I claim that Elmer's biggest mistake wasn't the one he made at Cedarville before six thousand witnesses. His prize bloomer was pulled in Hoboken before three witnesses

"You know," pursued Reggie seriously, "I think you are making the bloomer of a lifetime over this hat-swatting chappie. You've misjudged him. He's a first-rate sort.[…]

In 1933, four years before his death, Rutherford said, firmly and explicitly, that he didn't believe the energy of the nucleus would ever be released—nine years later, at Chicago, the first pile began to run. That was the only major bloomer in scientific judgment Rutherford ever made.

After 12 successive league wins[…]Charlton were nobbled by the First Division's no-hopers, who profited from a goalkeeping bloomer then held on to their lead for dear life.

She was a late bloomer.

Few garments are so absolutely unbecoming as a belted tunic that reaches to the knees, a fact which I wish some of our Rosalinds would consider when they don doublet and hose; indeed, to the disregard of this artistic principle is due the ugliness, the want of proportion, in the Bloomer costume, a costume which in other respects is sensible.

Unlike other women landing from the steamers, she was neither short-skirted nor bloomer-clad. She was dressed as any woman travelling anywhere would be dressed.

It would have to be smuggled back to Josie’s bloomer drawer. He could persuade her to confirm his other ideas without letting her see that he had read her particularly private correspondence.