Check the direction
Soft knit may stretch across the body but hardly along it. A tight armhole will not become comfortable because a product page says “stretchy”. Lay the garment flat, look at seams and gently check where the fabric actually gives.
How it recovers
After fitting, see whether neck and cuffs return to shape. If the garment creeps backward or bunches at the chest, the cut may be unbalanced. Compare measurements with the specific design rather than relying on stretch as a universal fix.
Check how the fabric recovers
If a sample is available, stretch it gently within normal use and release it. Does the edge return to its previous shape? Stretch and recovery are different properties. A permanently enlarged neck quickly changes the fit.
Ask about stretch direction. Fabric may stretch well across its width but very little lengthwise. Calling it highly elastic does not establish adequate back length or freedom of stride.
Seams and finishing also constrain movement. Soft fabric with rigid stitching in an important area can still be uncomfortable. Assess the finished garment as a whole.
Do not automatically choose a smaller size because the material stretches. Constant tension can create pressure and shift the armholes. Compare measurements and intended use first, then assess movement and the fit after recommended washing. Elasticity supports a suitable cut; it cannot make every cut suitable.
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