It is recommended to wear a slim shirt ... choose a suit that has just been worn ... This is just right ... Of course, you can't choose a loose suit ... If you can, wear a patterned V-neck long-sleeved thin sweater ... When you wear a suit, it will be a vacancy of the whole armhole ... The overall appearance will be more abundant ... You should choose a loose suit to wear a sweater .. If it is a slim suit, it will be very crowded ... This V-neck sweater. However, the contrast should not be too big ... you can choose a plaid tie ... or a more fashionable striped tie ... I hope these suggestions will help you. They are purely suggestions.