I've put a T-shirt on under my sweater for warmth.

我在毛衣里面穿了一件T恤，这样可以暖和点儿。

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Solution: Need more warmth?Instead of wearing a flannel or long-sleeve shirt untucked over a T-shirt, consider wearing a thicker sweater, with just a T-shirt underneath, and a jacket.

穿一件体恤、套一件天鹅绒外套，再敞口套一件长袖衬衫，不觉得自己像粽子么？

youdao

There was a while in the psychology department where one professor was known to be extremely supportive to his students but didn't really provide much warmth.

有一会儿在心理学系,一位教授对学生非常支持,但不能给学生温暖的感觉。

耶鲁公开课 - 心理学导论课程节选

Throughout his career, the work of singer-songwriter Eric Bachmann hasn't exactly radiated warmth, whether he was unfurling surly screeds as lead singer of Archers of Loaf or re-creating himself as a crooning indie-rock Neil Diamond with Crooked Fingers.

NPR: Touring the World, but Always Lost

Well, even if that warmth doesn't last forever, it has now helped one of its upstart competitors, HTC, to rise beyond Nokia in terms of market valuation.

ENGADGET: HTC's market capitalization reaches $33.8b, overshadows Nokia and RIM

But the fuzzy warmth clearly didn't rub off on whoever wrote the DUP's response to the Westminster boundary commission's proposals.

BBC: Peter Robinson takes the grandstand view