Your search for "matilda" revealed the following:

Matilda womens costume with blue dress, headband, bookbag and bookmark
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Matilda Womens Costume Buy Now

$85.00

Roald Dahl Matilda Kids Classic Costume, royal blue dress with matilda logo and print of books on skirt.
Roald Dahl Matilda Kids Classic Costume, royal blue dress with matilda logo and print of books on skirt.
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Roald Dahl Matilda Kids Classic Costume Buy Now

$58.00 $52.00

Roald Dahl Matilda Sustainable Childs Costume, royal blue dress, peter pan collar, logo at waist and print at hemline, dress, headband, newt and library card and book mar,k.
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Roald Dahl Matilda Sustainable Childs Costume Buy Now

$67.00