JOHANNESBURG (Reuters) - South African fashion retailer Truworths on Thursday reported a 6.3% decline in full-year profit, citing a drop in discretionary spending by customers squeezed by high interest rates. The upmarket retailer said headline earnings per share for the year to June 30 fell to 817.9 cents, compared with 873.3 cents a year earlier, and declared an annual dividend of 529 cents. (Reporting by Sfundo Parakozov; Editing by David Goodman)