An investor group headed by Wesray Capital Corp. has agreed to buy Simplicity Pattern Co. from Triton Group Ltd. for $117.5 million. Wesray, which has offices in New York and New Jersey, will complete its purchase of the sewing pattern company by late January. La Jolla-based Triton said it plans to use the $105 million that it expects to gain for business acquisitions, retirement of debt and repurchase of equity securities. Simplicity is among the world's largest producers of sewing patterns. For the fiscal year ended Jan. 31, it earned $4.4 million on sales of $72.2 million.