Long Tall Sally increased total group sales by 39% and online sales by 58% for the five weeks to the end of December.
The fashion retailer for taller women has 11 stores in the UK, seven in Canada, four in Germany and two in the US, in addition to a growing online business that accounts for more than two thirds of total sales.
More than 70% of online sales come from outside of the UK.
The company attributed the sales growth to more fashionable product bought closer to the season. It also improved its marketing through the use of systems that offered a single omnichannel view of customer inventory across markets.
Sales for the full year to January 31 are said to be on track to hit £30m and profits are expected to double from last year to £2m.
Total sales in the UK during the period were up by 17%, while the online business was up by 43%. Germany was the fastest growing market, with online sales increasing by 81% and total sales by 65%.
Chief executive Andrew Shapin: “The Christmas period has capped off an exciting year of growth for our business and we head into 2015 confident that we will continue to deliver stylish, fashionable clothing and footwear specifically designed to meet the unique requirements of the tall women of the world.”