Stretto vs. aderente

The Italian words 'stretto' and 'aderente' both describe tight-fitting clothes or shoes, but they have subtle differences in usage and connotation.

Stretto

'Stretto' generally means tight or narrow, and when referring to clothing, it implies a snug fit that may restrict movement slightly.
I pantaloni sono troppo stretti sui fianchi.
(The pants are too tight on the hips.)
Questa giacca è stretta sulle spalle.
(This jacket is tight across the shoulders.)
Le scarpe strette mi fanno male ai piedi.
(The tight shoes hurt my feet.)

Aderente

'Aderente' means form-fitting or clinging, suggesting a close fit that follows the body's contours without necessarily being uncomfortable.
Il vestito aderente mette in risalto la sua figura.
(The form-fitting dress accentuates her figure.)
I jeans aderenti sono molto alla moda quest'anno.
(Skinny jeans are very fashionable this year.)
La maglia aderente è perfetta per lo sport.
(The tight-fitting shirt is perfect for sports.)

Summary

While both 'stretto' and 'aderente' describe tight-fitting clothes or shoes, 'stretto' often implies a tightness that might be restrictive or uncomfortable, whereas 'aderente' suggests a close, form-fitting shape that follows body contours without necessarily being constraining. 'Stretto' is more commonly used for general tightness, while 'aderente' is often used for intentionally form-fitting fashion items.