The continued predicament of ill-fitting ready-to-wear (RTW) children clothing spoils consumer satisfaction and confidence in the market in Kenya. Parents of children between two and six years of age are used to incongruent sizing, mismatch of garments between labels of age and actual body size, and lack of locally tested size standards. The paper discusses the aspects of apparel sizing and fit among children aged two to six years in Kisumu, Nakuru, and Nairobi, Kenya. A mixed-methods research design was used based on a combined needs theory of clothing (Dunlap, 1928) and used 385 children, 100 parents, and 21 clothing industry professionals. Data collection was done through questionnaires, structured interviews, and focus group discussions and analysed via descriptive and inferential statistics. Findings showed that the most important factors in making RTW buying choices were clothing quality and durability (65%), correct sizing and fit (58%), and informed clothing choice (55%). The prevalent sizing strategy (69 percent) was physical fitting at the point of sale, which reflects the lack of a credible national standard. Sizing on the basis of age labeling was generally unsatisfactory. Problems such as variation in the size of the brands, low quality of garment work, and limited variety in the market were experienced by 80% of the respondents. The paper suggests the establishment and use of an anthropometric size chart of children clothing that is approved by Kenya Bureau of Standards (KEBS) to facilitate the Kenyan children wear industry that is increasingly on the rise. These results offer a critical basis on the design of standardised, evidence-based sizing schemes that are specific to Kenya apparel market, and have the potential to curb consumer dissatisfaction, garment returns, and enhance the competitiveness of children clothing produced in Kenya.