It's too big.
'Grande' — 'GRAN-de'. Two syllables, stress on first. The 'r' is lightly trilled.
When an item swamps you or hangs badly. Giving feedback helps the assistant find the right size. Don't hesitate to be direct.
'Troppo' (too much) + adjective. 'Grande' = big. For smaller: 'troppo piccolo/a'. For looser: 'troppo largo/a'. For tighter: 'troppo stretto/a'. Adjective agrees with the noun.
È un po' grande.
It's a bit big.
Softer — 'un po'' softens the statement
Mi va troppo larga.
It's too loose on me.
'Larga' — agreeing with a feminine item like 'gonna'
Nuota addosso.
It's swimming on me. (It's way too big)
Colloquial — vivid idiom for something far too large
In Italian tailoring, a well-fitting garment should 'cadere bene' (fall well) across the shoulders — the shoulder seam sits exactly at the shoulder bone. This is the primary fit indicator for jackets and blouses.