Todd Spangler NY Digital EditorSnap wants to get Snapchat’s young-skewing user base to buy more stuff through the social app. As part of that strategy, Snap has acquired Fit Analytics, a German apparel size-recommendation engine that helps online shoppers virtually find the right clothing size.Financial terms of the deal were not disclosed.Founded in 2010, Berlin-based Fit Analytics provides a product called Fit Finder to over 18,000 retailers and brands.