换上 + Clothing Item
换上 (huànshàng) means "to change into" a piece of clothing or outfit. The directional complement 上 indicates the result of putting something on. It is commonly used to describe switching from one outfit to another.
她换上了一条红色的裙子,准备出门。
tā huànshàngle yī tiáo hóngsè de qúnzi, zhǔnbèi chūmén.
She changed into a red dress and got ready to go out.
天气变冷了,我赶紧换上了厚外套。
tiānqì biàn lěngle, wǒ gǎnjǐn huànshàngle hòu wàitào.
The weather turned cold, so I quickly changed into a thick coat.
他换上运动服就去公园跑步了。
tā huànshàng yùndòngfú jiù qù gōngyuán pǎobùle.
He changed into sportswear and went jogging in the park.