As the English was 'bedsheets', draps de lit should be accepted as correct - it got the blue line through 'de lit'. There may be regional differences, but in Australia we would usually not say 'bedsheets' unless being very specific, and 'sheets' would be the same as 'draps'.
French people in Australia will often revert to saying 'bed linen' or sometimes 'bed sheets', but avoid 'sheets' because the French accent changes "I have the sheets" to a rather colloquial expression !
