Les vêtements

Porter is the verb you need most here, and it does two jobs that English keeps apart: to wear and to carry.

Elle porte une robe bleue. She is wearing a blue dress. Il porte les valises. He is carrying the cases.

Underneath they are the same idea, something supported on the body, and French sees no reason to split them.

Dressing yourself

S'habiller is the act of getting dressed. Se déshabiller is undressing. Both are reflexive because you are doing it to yourself, which is the same pattern as washing.

Mettre is to put on: je mets mon manteau. Enlever is to take off. So porter is the state and mettre is the moment.

Taille does two jobs too

La taille is your size in clothing and also your waist. That is not a coincidence, and it makes shopping vocabulary easier than it looks: the thing measured and the measurement share a word.

Sizes themselves are European numbers, and shoe sizes in particular do not map neatly onto British ones. Une pointure is specifically shoe size, which is a distinct word worth having.

Colours after the noun

French puts most adjectives after the noun, and colours always: une chemise blanche, un pantalon noir. The colour also agrees with what it describes, which produces une veste verte from vert.

The exceptions are colours borrowed from objects. Orange and marron do not agree, because underneath they are still a fruit and a chestnut: des chaussures marron, not marrons.

Trousers are singular

Un pantalon is one item and takes a singular verb, where English insists on plural trousers. The same goes for un jean. If you want a pair of anything in French you generally just say the noun.