Hindi · Pronunciation Guide
JAY-kayṭ — the first vowel is the long open-mid one of "bed," and the final t is retroflex.
jaikeṭ
Setting up the retroflex closure at the end gives the word a slower finish than the English original. That nativised final consonant is what marks it as Hindi rather than borrowed speech.
Listen: जैकेट
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जैकेट पहन लीजिए, बाहर ठंड है।
Jaikeṭ pehen leejiye, baahar ṭhaṇḍ hai.
Put on the jacket, it's cold outside.
Listen: जैकेट पहन लीजिए, बाहर ठंड है।
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Jaikeṭ pehen leejiye, baahar ṭhaṇḍ hai" ends with ṭhaṇḍ, adding an aspirated retroflex ठ and a retroflex ण to the ट already in jaikeṭ. Pehen shows the ह-colouring pattern, so its vowels are lowered rather than plain schwas.
The English original supplies a diphthong in the first syllable, an aspirated k, and an alveolar final t — all three of which Hindi has changed. The retroflex ending is the most audible fix: curl the tongue back before you close the word.