The N Brown Group, which trades as JD Williams, Simply Be and Jacamo, saw revenue rise 1% to £425.3m for the first half to 27 August 2016.
The FTSE250 group is transforming from being direct mail-led to digital-first, with two-thirds of revenues now coming from online.
The company is now expanding into the USA as it looks to increase its market share of the plus-size fashion industry.
Chief executive Angela Spindler said: “I am pleased with the progress we made during the half, as we continue to change to a digital business model, with an emphasis on agility and innovation.
“Spring Summer was challenging for the entire retail sector, and we were not immune to this, but we demonstrated our flexibility as we improved revenue performance through the season whilst controlling our costs well.”
She added: “The Autumn Winter season has started in line with our plans. Our improving agility is enabling us to trade the business in a volatile environment. At this stage we are comfortable with current market expectations for the full year.”