Applying optical illusion effects due to angle of stripes and colors, this paper considers designing uniform of soccer goal keeper looked to be large and wide. A pattern of alternating oblique lines, thick yellow and thin black, are chosen to the most largely and widely looked based upon the well known results in design of clothes and color psychology and statistical analysis on the answers to appropriately prepared questionaire. Field study has shown remarkable effects, "160%" under newly designed uniform and "23.2%" under currently used one.