The phrase "design fit" refers to how well something is designed for a specific purpose or situation. It means the design is suitable and appropriate for what it is supposed to be used for. Full definition
Choose a design that complements your existing colour scheme so it looks like it's been there all along — this beige design fits in beautifully with this neutral scheme. (idealhome.co.uk)
All the private rooms are spacious and contemporary designed fitted with a comfortable double or twin beds and private en - suites. (vietnambackpackerhostels.com)
Use these fabulous dining room ideas to create a delightful design fit for a special occasion. (idealhome.co.uk)