Marchpole swung to a pre-tax loss of £6.1 million for the 53 weeks ended April 5, against a £6.3m profit the previous year.
Marchpole, the brand management group which has the Boateng, Emmanuel Ungaro and Jean Charles de Castelbajac within its portfolio, saw sales half to £44.7m for the period.
Marchpole said it has experienced difficult trading conditions, in particular with one of its major international partners and with one of its "significant" UK customers, which results in the heavy losses.
Marchpole executive deputy chairman Michael Morris said: "This has been a challenging year for the company. However, our pipeline remains healthy and in line with our growth strategy, we have successfully strengthened our presence in major brand-driven consumer markets through new earnings enhancing licensing and partnership agreements."
Morris added: "Marchpole is no longer reliant on a single brand and is now a well diversified multi-brand business. Through a number of new initiatives during the year, we have laid strong foundations to capitalise on our core strength of fashion brand management on an international platform. We have continued to source new earnings enhancing opportunities to deliver solid growth over the longer term."