Fashion sales at John Lewis were down 5.1% for the week ending 21 December, compared with the same week last year.
Total sales at John Lewis were also down 5.1%. However, womenswear sales bucked the trend with sales up by 3.5%.
The retailer said the figures were a result of the continued effects of a “strong Black Friday”.
“Our announcement on Friday that we were extending the deadline for Click & Collect orders to Christmas Eve, at both John Lewis and for the first time 294 Waitrose shops, increased online orders at the end of the week,” the retailer said in a statement.
Earlier this month, fashion sales at John Lewis fell by 13.1% for the week to 14 December, compared with the same week last year.
Sales during the 10 days surrounding Black Friday rose 13% year on year at John Lewis, with a “record week of sales” across menswear and bestsellers including Barbour.