Charlesbank Capital Partners said late Wednesday that it has acquired OneStopPlus Group. Financial terms weren’t announced. PPR, the Paris-based luxury and sport & lifestyle group, is the seller. Webster Capital is also investing. New York-based OSP is a catalog retailer and online marketplace for plus-size consumers. Michael O’Hara of Consensus Advisors provided financial advice to Charlesbank, while Peter J. Solomon Company acted as financial advisor to PPR.