The article examines the features of the transformation of the sleepwear as outerwear phenomenon into a sustainable market niche under conditions of blurred boundaries between private and public spaces, as well as the engineering-design contradiction revealed during the implementation of loose silhouettes — the paradox of biomechanical compatibility, when patterns designed for static postures and a small amplitude of movements do not meet the requirements of urban dynamics. An empirical marker of the problem is identified as a high share of returns in e-commerce — up to 53% for fit-related reasons. The aim of the work is the scientific verification and reconstruction of the author’s fit methodology (La Magnetique brand), interpreting the product as pajamas for the city. The methodology presented in this study was developed by the author, Kateryna Frumina, as an original engineering-design system integrating textile mechanics, dynamic anthropometry, and adaptive construction logic. The methodology includes a review of publications from 2024–2025 (Scopus, Web of Science), analysis of dynamic anthropometry data, and a materials-science assessment of textiles using the Kawabata Evaluation System. It is shown that the La Magnetique approach forms a system of adaptive patternmaking: the bending rigidity of the material (B) is correlated with the morphological parameters of the dominant somatotype rectangle, increasing the predictability of fit and the stability of form in motion. The biomechanical expediency of replacing silk with lyocell (Tencel™) is substantiated, ensuring form stability while maintaining high drapeability (DC), which confirms the brand’s positioning as a technological pioneer in the luxury loungewear segment.
Kateryna Frumina (Mon,) studied this question.